US1872842A - Call recording and charging system - Google Patents

Description

Aug. '23, '1932.- P. s'roRcH ET AL CALL RECORDING AND CHARGING SYSTE Filed March '11 1951 s sheets-sneet' 1 S S E S IEEFE'HEFE' Paul 5 are :1 Russbar'j Hfii.

P. STORCH ET AL CALL RECORDING AND CHARGING SYSTEM Filed March 11. 1931 Aug. 23, 1932.

3' Sheets-Sheet a 9N mtm tm m Nmd v h t D .u DE h 5 7 v7. Tm m F P.' ST ORCH ET AL' CALL RECORDING AN D CHARGING SYSTEM Filed March 11, 1951 .0 o M W 3 Q g 2Q Aug. 23, 1932. A

- omen STATES PATENT Patented Aug. 23, 19 32 I OFFICE p P-QULBTOBCH, OF BEBLIN-CHABLOTTENBURG, AND ROSSBERG, OF BERLIN- SIEIIENSSTADT, GERMANY, ASSIGNORS TO SIEMENS & HALSKE AKTIENGESELL- SCHAFT, F WERNERWERK SIEHENSSTADT, NEAR BERLIN, GERMANY CALL RECORDING AN D CHKRGIN G SYSTEM.

Application filed March 11, 1931, Serial No. 521,736, and in Germany June7, 1930.

It is desirable in telephone systems as well as in telegraph installations with exchanges T to determine not only the number of connections set up by subscribers outgoing over the ordinary local exchange, but also the duration of such calls in order to furnish a correct statement of the charges incurred by the calling subscriber. For telephone and telegraph systems with automatic operation it is a known arrangement to divide the network into zones for the determination of the value of-set-up connections, in which case each zone has its own tarifi and when selected a time switch associated therewith influences the conversation indicator associated with the calling subscriber giving the time and distance corresponding to the zone involved. In this manner the duration of the call as well'as the zone is determined to a certain extent. v

- In this kind of registration of subscribers connections the disadvantagehas often been experienced that the total time during which the junction line has been busy has-not been indicated but only the completed or the cornmenced time sections have been metered. In the first place, it is impossible to carry out a supplementary control over the set-up con nections as neither the zone of the-set-up connections nor the duration ofan individual connection can he obtained from the note made of the conversation indicator, still less then can a special indication of the direction of an individual connection be obtained.

In order to overcome these difiicult-ies electrically driven recording devices are used, according to the invention which automatically, after the setting-up of an operative cQn'nection indicate a designation mark i. e. the name, place number of the like, allocated to the subscriber, by which a subsequent con-- .The recording dev'ce used for the purpose trol of the sethpgconnections is possible.

of denoting' the i entification marks must,

of course, be allocated either'to the calling .subscriber'as he is charged with the account for the calls, or it must also indicate an identification mark for the calling subscriber,

when, for the sake of economy, only a limited numberof such devices are used as recording devices. Ifnot only the set-up connection but also its duration is to be metered, a time statement in addition to the noting of the subscribers identification marks. -must be taken, which, according to requirements,- either indicates only the duration of a'connection or else gives an accurate account of the time, date, etc. i

The record can be taken in any shape or form suitable for the kind of transmitted subscribers identification marks or for the time statement. In telegraph systems-it is recommended to use a receiving apparatus which is suitable in its operation for the telegraph system so that also the sender used for the transmission of the subscribers identi-fication marks corresponds in its operation to the devices used for the ordinary work in the system. In this case a particularly advantageous use ofthe subscribers identification marks employed for the registration can be carried out in that the identification mark, allocated to the called subscriber, simultaneously with the registration in the exchange is also transmitted to the purpose of supervising the set-up connection as well'as for check back to the calling subscriber. The time statement which is taken in order to determine the duration of the connection in the exchange'can then also be noted and transmitted to the calling subscriber .with the result that he receives a notification of some sort to the extent of his call.

In addition to the transmission of the identificatlon marks or times to the calling subscriber, a transmission to the called subscriber can naturally also be eflected in case he desires full particulars of each call in a written statement. 4

Instead of the receiver, fitted to operate in the system, which can be in the form of a recorder'as used in telegraph'systems, op-

erating according to the otf-and-on principle,

plied with a recording device within an exchange as then a simple tape receiver or'the like can, for example, be used in place of expensive recorders. In additionito such a mechanical recording as dots or dashes also other kinds of records can be made. It is possible, for example, to conduct the re-v ceived impulse to an electromagnet which makes impressions corresponding to the nature of the magnetic influences received.

For the reproduction of impulses recorded in this simple manner, a reproducing device can be used which regenerates the recorded impulses and leads them, for example, to a recording receiver which executes the transscription of the impulse groups into readable types. The transcription can be effected at suitable periods, i. e. at the end of the month when the accounts are sent out to the various subscribers.

If an automatic registration of the subscribers identification marks is to be carried out in telephone systems each individual subscriber must be supplied with a corresponding device which automatically effects the recording of the identification marks, associated with the subscriber, at the switchingthrough of a connection to a required sub-.

scriber. These sending devices can either be installed at the subscribers stations or else be connected to the subscribers lines at a suitable position within the exchange. Also in this case it is naturally of vital importance that the notification takes place over the correct junction line of the calling subscriber and this can be guaranteed either by exclusive allocation of the receiving device to the calling subscriber or by recording also of the identification marks associated with the calling subscriber. For a more complete explanation of the features of the invention, embodiments thereof are shown in the drawings which, however, do not limit the possibilities of use in any direction.

Fig. 1 shows the known circuit of a subscribers connection, set-up over an automatic exchange. Subscriber T1 who is by way of example, reach the required subscriber T2 by transmitting corresponding impulses by means of his dial over preselector VWl, group selector GWl, and the final selector LWl, with whom he can get into communication on completion of the-connection for the purpose of conversation or transmission of telegrams.

A connection set-up in the reverse direction (2) from subscriber T2 to subscriber T1 is effected over other switches VW2, GW2, LW2 as suggested by dotted lines.

An extension of this circuit diagram ac,- cording to the main features of the invention is shown schematically in Fig. 2. Each subscriber T1 and T2 is now supplied with a sending device on a passing steel wire a toll line subscriber, can

'ceiving device S1 and S2, respectively, as

well as a receiving device El and E2, respectively, for the purpose vof registering the set-up connection. When, for example, the subscriber T1 has reached over switches VVVl, GW1,and LW1 the sending device S2 responds at the same time or before the completion of the connection, and now transmits an identification signal allocated to subscriber T2, i. e. his name or number in a suitable form backwards over switches LWl, GWl, and -VW1 to the re ceiving device E1 in which the recording of the identification signal is effected. At the same time, the identification signal can be transmitted in a similar manner tothe calling subscriber T1 also who thereby receives a check on the set-up connection. After the end of the transmission of the identification signals the set-up connection is prepared for conversation or code signals.

If, in addition to the determining of the subscribers identification characterized a registration of the extent of the call'is to be effected, a time notification can be transmitted from a time recorded Z to the receivv T ing device E1 consisting by way of example, of the exact time of the beginning and end of the conversation. The time recorder can be associated with the receiving device E1 in a simple form and operated in such a manner that it is automatically brought into operation after the complete setting up of a connection or after the transmission of the identification characterized, but it is recommended that a common timing device is used for a plurality of subscribers in the manner shown.

At the setting up a connection from subscriber T2 to T1, which is completed in the direction 2 over switches, VWV2, GW2, and LW2, the sending device S1, associated with the called subscriber T1, is brought into operation in a corresponding manner, and trans mits an identification signal allocated to subscriber T1 to the receiving device E2 or simultaneously also to the calling subscriber The connection can be set-up in any manner over a single exchange or a plurality of exchanges. g

If a common receiving device for the recording of the subscribers identification marks is to be used for a plurality of subscribers an arrangement as shown schematically in Fig. 3, by way of example, can be used. When a connection between the subscribers T1 and T2 is set-up the sending device S2 is brought into operation after the completion of the connection as before, but the recording of-the identification characteristic is not made by a receiving device directly associated with subscriber T1, but a rc- E, provided in common for a plurality of subscribers, operates and connects itself at the setting upof a connection the. subscriber T2,

the sending device S2 the sending device S1,-

allocated to the calling subscriber T1, also 5 is brought into operation, with the result that a determination of the two subscribers identification signs is effected. The time records, totaling the extent of calls, can also be transmitted in this case by a. commontime recorder Z.

Fig. 4a, in conjunction with Fig. 4b, which should be located below Fig. 4a shows-the circuit of a telegraph system inwhich the metering and registration of connections is effected by a telegraph machine EF, (Fig. 4a bottom) which is associated with alar e group of subscribers; its connection with t e calling subscribers line is established by a call finder AS which operates automatically when the subscriber uts througha call.

In the middle portion of the drawings the two sending devices KS and KS intended for the enquiry of the subscribers identification characteristic are located which are allocated to the subscribers TS and TS, respectively. The impulse combinations which correspond to the subscribers identification characteristic and which are transmitted over v two of the'contact wipers of the sending devicesKS and KS sending device SS which is shown in the right-hand bottom part of thedrawings (Fig: 4a). The sending device is connected to a time recording mechanism ZS (Fig. 4b) which transmits the time.

In the'case of a call from the subscribers station TS (Fig. 4a) which can be switched through in the shown or any other known manner, a test relay T is energized after the hunting of the preselector VW to a free group selector GW in known manner. The relay T starts the call. finder AS of a disengaged registering device over its contact t2 1n the circuiti Earth, t2, asl, DAS, 12, a3, LU battery, earth. The interrupter LU advances the driving magnet DAS step-by-step, upon which the-circu it, after leaving the first contact, no longer extends over contact t2 but reaches earth .direct from the contact bank of the rotary wiper asl.

The test wiper cs4, during its hunting to find the contact of the calling subscriber, finds, a test path closed over contact 251 with the result that the test relayR of the call finder AS is energ'izedover: earth, battery, t1, resistance W1, as4, R, earth. The test relay R engages the call finder and thereby the registering device EF by short circuiting its high resistance winding I by means of contact r1 is 'set in 'known manner, while at the same time, the Further advancing of the call finder is prevented by the opening of contact 12. e r N The receiving magnet MB of the register- 5 device EFis now connected to the b-lead of the busy junction line,

are generated in a mainover the alternating contact a2 and the rotary wiper as2.

In the meantime the calling subscriber TS, by transmission of selecting impulses by means of the dial contact as sets up a connection with the required subscriber TS over the a-lead in known manner, extending over :switches-VW, GW, and LW. Hereby relays P and G are energized at the operationof the group selector GW to a free final selector LW, the contacts of which in known-manner influences the circuit not shown) for the seizure of the switch connecting up of the junction lines, reparation for the release, etc.

On the l iunting of the final selector LW for the line leading tothe required subscriber TS the test relays Q and T are energized if the subscriber is disengaged. At the'sametime, the relay H (winding Disconnected up over the test lead of the final selector and causes the identification characteristic mark transmitter KS allocated to the required subscriber to be operated over: earth, Q, 10, H,

(1) 4101, T, battery, earth.

'The identification transmitter KS operates as soon as contact 72/2 is closed earth, battery DKS', 7084, 7:2, SK, earth. Contact SK is closed by the cam the'correct time for the connecting up of the N K of the main send- Y er SS at regular time intervals in order to fix identification transmitter. On the shaft NW of the main sender which carries the .cam NK 9. further series of cams NS are fitted which serve to guide the impulse contacts associated with the letters and numbers for the identification signs and time record which is achieved by a suitable phase position of the cam NK in relation to the impulse, cam NS in this simple manner that the'advance of the rotary wipers of the identification sender,'

transmitting the impulse can only take place in the pauses between the impulse groups corresponding to the individual roups. The driving magnet DKS of the identification transmitter KS is intermittently energized in the above-described circuit and thereby advances the rotary wipers KS and KS4 step by-step.

In this manner, while the identification transmitter remains on the second contact after the first movement of its rotary magnet 'DKS, an impulse sequence corresponding to the first letter of the identification signs of the called subscriber is transmitted over the rotary wiper 7083 to the called subscriber TS at the same time to the registering device EF.

The generation of the impulse .sequence, corresponding-to this letter i. e. b is efi'ected by contact kb of the-main sender SS which, by the cam NS associated therewith, is closed intermittently. according to the impulse sequence over: earth, battery, resistance W2. lab, a-lead, 1a, b'lead, gb, "bb', wiper of call "findersaa2, 'u 2, MR, earth. The impulse sequence is noted by theregistering device EF controlled by the printing magnet-MR. At the same time a notification takes place at the calling subscribers station TS by means of a printing'magnet EM of the receiver in case this is required as a check on the setting up of the connection. I

After the transmission of the impulse sequence corresponding to the first letter of the identification sign (i. e. b) further impulse groups are transmitted in a corresponding manner by the connection being set up with corresponding impulse contacts of the main sender by the rotary wiper Ira-'3 of the identification transmitter KS. The further advance takes place each time in the intervals between the individual impulse groups at the gging of contact SK by means of the cam In addition to these impulse groups further impulse groups can be transmitted which effect the notification of the exact time or any other time information, and these latter impulse groups can be connected up to the impulse groups which are so combined that they state the name and place of the required subscriber in the recorder of the subscriber TS or in the registering device EF of the exchange. The impulse groups, corresponding to this time statement, are sent out from the time sender ZS (Fig. 4b) the contact wipers SZ, SE, MZ, ME of which complete the connection with the meter impulse contactslcl, k2, k3, and 704, etc., of the main sender SS, (Fig. 4a). d

The advance of the contact wipers SZ- ME (Fig. 4b) operate the rotary magnets DSZDME, associated with them, which are operated in the time periods corresponding to their tarifi's by contacts ns-mme o a'time switch device ZU. The arrangement, by way of example, is so made that the contact wiperME is associated with minute periods and is advanced in periods of one minute for which purpose it is connected in sequence with the impulse contacts (741,-etc.) of the main sender corresponding to digits 0 to 9. In a similar manner/the advance, of the contact'wipers MZ associated with ten minuteperiods, e. g. every ten minutes, while thqntact wipers SE and SZ respond to the hour units or ten hour units and are advanced accordingly after longer time periods.

By this arrangement it is achieved that, in connection with the transmission of theidentification characteristic of the called subscriber, a transmis ion of impulses is effect.- ed which corresporEls exactly to the correct time. Other infor ative signs, such as stop, common or the like can be transmitted between the records of the time notification and the notification of the time can also be supplemented by the date.

As soon as the time notification is ended, a special impulse combination is transmitted over the last but one contact of the identifica- 'to operateover contact 712 magnet DKS being energized over: earth,

SK, earth. The guidtion sender KS controlling the registering device. This impulse combination which differs from the other signals by its composition is generated by a special impulse contact ku of the main sender and upon its trans- I mission to the receiving magnet MB of the registering device EF, actuates the closing of a contact UZ which over the test lead of the call finder connects up relay Uover: earth, UZ, U, as, W1, t1, battery, earth. Relay U remains energized over its own contact ul, with the result that the contact UZ can return to normal.

At the same time a fresh circuit for the receiving magnet -MR of the registering device EF is prepared by the changeover contact u2, which extends over the rotary wiper cs3 of the call finder AS to the rotary wiper 1082 of the identification sender KS allocated to the calling subscriber. transmitter operates, however, only after the cutting-off of the connection in order to transmit simultaneously also the time of the termination of the conversation.

After the transmission of the change-over signal (we) the. rotary wiper ks3 of the identification transmitter/KS allocated to the called subscriber is moved to the last contact on which the completion of the connection of the a-lead to the called subscriber TS is completed.

The junction line between the subscriber TS and TS is now engaged for the transmission of the telegram in both directions.

During the existing connection the registermechanically This identification ing device and also the identification transmitter allocated to the two subscribers, are

intheir normal positions so that an interf ruption of the transmitted telegram is prevented. At the same time a listening in to the telegram is also prevented by the registering device EF and by the throwing-over of contact a2, whereby the secrecy regarding the contents of the telegram is insured.

' After the ending of the telegram transmission the test relay T, at the release of the connection, is caused to release by the influence of contacts known per se, showniorthe sake of greater lucidity. Thereby a circuit for winding II of relay H is closed over contact 253 returning to normal. whereby the idenfication transmitter KS of the calling subscriber TS is in operation over: earth, battery, H, (II), t3, Iss2, as3, 102, MR, earth. Contact M is closed in order to keep the energizing circuit for relays R and U closed as an alternative for the now opening contact t1. The identification transmitter KS starts dueto its rotary battery DKS, 1084, 71.2,

ing contact SK of the main sender SS again, in the manner already described. caus s the advance of the wiper of the identification which are notsignaltransmitter to be effected in the coran impulse over contact SK and the rotary wipers of the identification signal transmitter KS has moved to the next contact the impulse sequences, generated by the cam contacts of the main sender SS. are transmitted to the receiving magnet MB .of the registering device EF earth, MR, a2, -as3, Iss2,

junction line to-main sender, impulse con- 'is set to normal over earth, asl, DAS, 1'2, a3, LU, battery, earth.

tact (ire. 7m) resistance W2, battery, earth.

When thus the signal has been transmitted to the called subscriber t e transmission of the time notification whici is brought about in. the above described manner takes place over a second portion of the contact laminations of the rotary wiper [082.

As soon as this time notification has been recorded by the recording machine the identification transmitter KS advances to the last contact. In this position the holding circuit for relay H (winding II) is broken which, before, was closed over the hunting laminatioris of the rotary wiper ksl. The relay H releases slowly and closes thereby the restoring circuit for the rotary magnets DKS over its contacts 7L2 and 723, respectively, with" the consequence that this sets the switching mechanism to its original position. Contact k1 breaks the test circuit for the call finder AS so that relaysR and U are deenergized. A circuit for the rotary magnet DAS of the call finder AS is then closed by the return to normal of contacts 12- and n3, which then In the meantime the identification transmitter KS of the called subscriber TSl has also reached its original position, as at the release of the connection, the relay H1, (winding I) located in the test 'lead of the final selector LW has released. The rotary magnet DKS now receives the advancing impulses generated by the interrupter RU, over contact h2 or h3, respectively,which bring the rotary wipers to their normal position.

All the switching elements concerned inthe establishment of a connection are now set back to their original positions and ready for a new call. On the tape of the recording device the statements can be'read' in plain letters which relate to the set-up connection and the duration of its extension;

v Fig. 5 shows an arrangementin which each subscriber is supplied with "a simple registera ing device which, byway of example, records the impulses,characteri'zing the set upconnec tion and its-duration on asteel wire drawn in front of a magnet. Impulses stored in this manner can later be put into clear text by a. recording machine transcribing the Onthe setti f I relays T, B, P, C, Q, and T are energized am. In adsigns which form the! basis for the statement of account. a I

1n the drawings the recording device consists of an electromagnet SM with windings I and II in front of the poles of which a steel wire X is moved over the drums Y1 and 2. The winding I is influenced at the settion transmitter allocated to the called subscriber, while winding II can be brought into ting-up of a connection by the identificaoperation by a time recorder ZG, shown in the left bottom portion of the drawings, for the purpose of recording the time notifications indicating the duration of the call. A notification of the identification signal allocated to the calling subscriber is not necessary in this case as each individual record ing device is associated with only one individual subscriber. In order to make the case clearer only the identification transmitter KS, allocated to the'called subscriber TS, is shown in the drawings, While the one-for the calling subscriber TS has been omitted.

The number of time recorders ZG required in a system can be comparatively small as it is sufficient if, at the establishment and release of a connection, a short connecting up of the recording magnet SM to a free time recorder is effected. The selection of a disengaged time recorder is performed, by way of.

example, by a call finder AS allocated to a group of subscribers.

' When, for example the subscriber TS wishes to transmit a telegram to the subscriber TS he sets-up the connection selectively by means of his dial in manner known per se over theswitches VW, GW, and LW.

ng-up of the connection the test DKS over the ca'm contact SK- of the main sender SS, while over the contact wiper 7: '1 the impulse groups transmitted by the same to the letter contacts ka, kb, kc, etc., of the main sender are meanwhile sent in the a-lead in the sequence which corresponds to the identification signals of the subscriber TS.

These impulse groups now reach the winding lof the recording magnet SM' of the registering device over contact wiper 1a of the final selector LW, the contact wiper gb of the group selector GW andthe wiper ob or the pres'elector VW and further the re .ceivingmagnet SM of the'calling subscriber TS. The recording magnet SM- thereon rebords the transmitted impulses of the iden- 'lgo ' clear type,

tification signals on the steel wire X, passing in front of its poles, which in the meantime, has been-set in motion,'while the receiving magnet EM of the subscriber TS immediately transcribes the identification signals into so that the calling subscriber receives a check of the set-up connectien.

Relay U (winding I) which is placed in series with the winding of the recording magnet SM is constructed in such a manner that it is not energized by the signal impulses. It operates with a slow-acting armature and the slow action period is so calculated that it cannot respond to the short signal imulses. Only when the contact wiper ks'l of the identification transmitter KS connects battery to the a-lead on one or a plurality of contacts located in frgnt of the last contact over resistance W4 for a longer period can relay U (winding I) be energized. It then closes a circuit by means of its contact a2 for the holding winding II which at the response of the test relay T, has been prepared by the closing of contact t1. The alternating. contact ul disconnects the winding 1 of the recording magnet SM and effects, at the same time, the immediate connecting up of the b-lead of the calling subscriber TS.

Instead ofthe slow-acting relay U any other device can be used which operates in the same manner over the a-lead or b-lead from the identification transmitter- KS of the called subscriber. It is possible, for example, to use a polarized relay which remains in one position during the transmission of the identification impulses and which receives an impulse of opposing current direction at the last but one step of the contact wiper ks'l which it momentarily guides to another position.

After the connecting up of the b-lead of subscriber TS by the throwingover' of contact ul the a-lead of the called subscriber TS is also connected up as the contact wiper'ks'l of the identification transmitter KS moves to the last contact. On this contact the identification transmitter remains until the release of the connection takes place.

The connection between the two subscribers is now set-up and the transmission of the telegram can commence; V

In the vmeantime the call finder AS of the I time recorder ZG has been started over contact a5 and a circuit for the rotary magnet DASot thecall finder has been closed over: earth, b3, M5, (183, DAS, r4, UAS, battery, earth.

The interrupter UAS now advances the switch over the contact bank of the rotary wiper as3 until the test wiper asl reaches the contact laminations of the calling subscriber and the test relay R is energizedv over: earth, battery, 104, H I (II) k2, asl, zgl, R, earth. The test relay R responds and engages, at the SK of the main sender over the already closed contact 1 2 is it caused to operate over: earth, battery, a4, H (II) lt2,as1,1-2, SK, earth. It then throws over its contact hi! and remains energized over this in addition to the closed Contact t3 of the test relay T.

Simultaneously with the connecting up of relay H the rotary magnet D7 G of the time recorder ZG isalso energized, with the consequence that the test relay R remainsenergized over the traversing contact bank of the rotary wiper zgll and resistance W1. The rotary magnet DZG is connected up in the following circuit: earth, battery, DZG, 293, 1'5, SK, earth. Now the time recorder ZG also advances step-by-step according to the operation of the identification transmitter by the contact SK controlled by the main sender SS, at which the rotary wiper 292 sets-up the connection with the contact wipers SZ-ME of the time switching device in succession. The contact wipers SZ-ME are set to the contacts, indicating the time in the manner described for Fig. 46, by the rotary magnets DSZDME, controlled by a time switch ZU. These contacts are connected to the impulse contacts I01, 702, k3,ietc., of the main sender the contact wiper 292 of the time recorder,

successive impulse groups are transmitted, the combination of which indicates the time.

When noting down is effected by the recording magnet SM, the winding II of which is connected to the contact wiper 292 over: a3, M2, and 1'3.

As soon as the time recorder ZG has reached its last contact the rotary magnet gization of the rotary magnet DZG- over the interrupter UZG. The time recorder is thus operated until it ha s reached its original position. a

At the release of that test relay R also contact 94 was closed so that the call finder AS can also return to normal. A renewed starting of the call finder cannot now take place as relays H and T remain energized and contacts t2 and k3 open. The time recorder At the hunting of the wipers SZ-ME by .lease of the connection. A

iii

after efl'ecting the connection between the two subscribers.

A renewed connecting up .of the time re-- corder for the connection mentioned can only take place when the test relay T, of the calling subscriber TS is deenergized at the refree time recorder for the notification of the end of the call is then again started over contact as the rotary magnet DAS of the call finder AS is connected up over" contact wiper as?) in the already described manner. Thetest circuit. for the call finder is then closed over contact t4 as relay H is energized and contact k2 thrown over. Thus the contact t3 is opened but the relay H (II) yet remains energized duririg the time notificationyas it receives theimpulse transmitted by the controlling contact SK over the test wiper asl. of the call finder and over contact r2 after the response of the test relay R. Relay H is constructed in the form of a very sloW-actin relay. Thereby is achieved that relay U II) remains con.- nected upover contact hl during the time notification.

After the transmission of the impulse groups, correspondingto the'time of the end of the call, which ise'ifected in the already described manner, the test relay R is again deenergized when the, time recorder reaches the last but one contact, with the result that the time recorder sition. Hereby relay H also is deenergized with a slow action and causes also the deenergization of relay U at the opening of contact k1.

Thesystem now is again prepared for further calls as in the meantime the identification transmitter KS of the called subscriber also has been brought toits original position at the release of the connection by the release of relay H. I

The steel wire X whichis brought torest' after the ending of. each time notification now carries the transmitted impulses which later can be transcribed into ordinarytype by a special printing machine at a calculation of the charges incurred.

What is claimed is:

1. In a call recording and charging system, calling and called subscribers lines,

a means for establishinga'connection between T a calling line and a called line, means auto- ;matically operative responsive to the 'establishment,of said connection'in case the called line is idle for transmitting back over the established connection an identification signal assigned to the called subscribers line, and a recorder associated with said calling line operated responsive to for recording said called line identification signal.

, 2. In a call recording, and charging system; calling and called subscribers lines,

returnsto its starting po said transmission means for establishing a connection between a calling line and a called line,- means automatically operative responsiveto the establishment of said connection in case the called line is idle for transmitting back over the established connection an identification sigrecorder, andmeans responsive thereto for' operating said recorder to record the calling line identification signal. v

3. In a call recording and charging system, calling and called subscribers lines,

means for establishing a connection between a calling line and a called line, means operative in case the called lineis idle for transmitting back over the established connection an identification signal assigned to the called line and the time of day, a recorder-temporarily associated with'the calling line responsive to the establishment of said connection and operated responsive to said transmission for recording said called line identification signal and time of day, means for releasing said connection, and means responsive thereto for transmitting an identification signal assigned to the calling line and the time of day to said recorder for operating said recorder to record the calling line identification signal and the time of day whereby the lines, a recorder common to said calling lines,

means for establishing a connection between.

a calling line and a called line, means'for associating said common recorder with said calling line, means automatically operative responsive to the establishmentofsaid connection in case said called line is idle for transmitting back over said established connection can identification qsignal'assigned to the called subscribers' line, and means responsive tosaid transmission for operating.

both the individual and the common record ers to :record the called'li ne identification signal.

5. In a call recording andcharging system, calling and called subscribers"lines, a recorder individual to each of'said calling lines, a recorder common-tosaid calling lines, means'for' establishing a connection between a calling line and al'called -line, means for.

associating said common recorder'with said calling line, means automatically operative responsive to the establishment of said'connection in case said called line is idle) for transmitting back over said established connection an identification signal assigned to the called subscribers line, and time signals,

and means responsive to said transmission for operating both the individual and the common recorders to record the called line identification signal and said tnnc signals.

6. In a call recording and charging system,

calllng and called subscribers lines, an 1111- pulse sender common to sald lines, a switch individual to each line having their bank contacts wire'dto said impulse sender in accordance with their assigned numbers, a recorder, means for establishing a connection between a calling line and a called line, means responsive to the establishment of said connection for connecting the switch individual to the called line tosaid sender, means controlled by said sender for operating said individual switch and for transmitting a signal indicative of the called line over the contacts connection between a calling and a called line, means controlled by said sender responsive to the establishment of said connection for operating the switch individual to the called line and for transmitting a signal indicative of the called line andthe time of day over the contacts and said connection, and means responsive to said transmission for operating said recorder. to record the called subscribers signal and the time of day.

8. In'a call recording and charging system, calling and'called subscribers lines, an impulse sender common to said lines, a switch individual to each of said lines having their bank contacts wired to said sender in accordance with their assigned numbers, a recorder,

means for establishing a connection between i a calling and a called line, means controlled by said sender responsive to the establishment of said connection for operating the switch individual to the called line and for transmitting a signal indicative of the called line; over the contacts of said individual switch and said connection, means for releasing saidconnection, means controlled by said sender responsive to said disconnection for operating. the switch individual to the calling line and for transmitting a signal indicative of the calling line over the contacts of the switch individual to the calling line, and means responsive to both transmissions for operatingsaid recorder to record the called and calling subscribers signals."

9. In a call recording'and charging system, calling and called subscribers lines, an

means responsive to lines, an imimpulse sender common to said lines, a time switch common to said lines, a switch individual to each of said lines connected to said sender and time switch, a recorder, means for establishing a connection between a calling vand a called line, means controlled by said sender and time switch responsive to the establishment of said connection for operating the switch individual. to the called line and for transmitting a signal indicative of said called line and the time of day over said connection, means for releasing said connection, means controlled by said sender and time switch responsive to said disconnection for operating the switch individual to the calling line and for transmitting a signal indicative of said calling line and the time of day, and both transmissions for operating said recorder to record the called and calling subscribers identification signals and the time of day the connection was established and released. 7

10. In a call recording and charging system, calling and called. subscribers lines, means for establishing a connection between a calling line and a called line, means responsive to the establishment of said connection for transmitting an identification signal assigned to the called subscribers line, and a recorder associated with said calling line operated responsive to said transmission for retiording said called line identification signa "11. In acall recording and charging system, calling and called subscribers lines, means for establishing a connection between a -calling line and a called line, means responsive to the establishment'of said connection for transmitting an identification signal assigned to the called subscribers line, a recorder operated responsive to said transmission for recording said called line identification signal, means for transmitting an identification signal assigned to the calling line to said recorder, and means responsive thereto for operating said recorder to record the calling line identificationisi'gnal.

12. In a call recording and-charging sysoperated responsive to said transmission for recording said calling line identification signal and time of day, means for releasing said connection, and means responsive thereto for. transmitting an identification signal assigned to the calling line' and the time of day to said recorder for operating said recorder to recordthe calling line identification signal-and the time of day whereby the duration of the i call is likewise recorded. v a 13. In a call recording and char 'ng system, calling and called subscribers lines, a

recorder individual to each of said lines, a recorder common to said calling hnes, means for establishing a connection between a calling line and a called line, means for 5 associating said common recorder with said calling line, means automatically operative responsive to the establishment of said connection for transmittin an identification signal assigned to the called subscribers line, and

' 10 means responsive to said transmission for operating both the individual andthe common recorders to record the called line identification signal.

In witness whereof, I hereunto subscribe 15 my name this 27 th day of January, A. D. 1931.

PAUL STORGH. In witness whereof, I hereunto subscribe my name this 27th da of January A.D. 1931.

, EHR ROSBERG.

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