US1852994A - Signaling apparatus and method - Google Patents

Signaling apparatus and method Download PDF

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Publication number
US1852994A
US1852994A US267680A US26768028A US1852994A US 1852994 A US1852994 A US 1852994A US 267680 A US267680 A US 267680A US 26768028 A US26768028 A US 26768028A US 1852994 A US1852994 A US 1852994A
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contacts
circuit
impulse
impulses
relay
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Frischknecht Ernest
Abegglen Jean
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TELERGISTER Corp
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TELERGISTER CORP
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1804—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast for stock exchange and similar applications

Definitions

  • This invention relates to electrical signaling and more particularly to signaling apparatus andvmethods, according to which information concerning a large number of 5 different items'ma be made available 'ata plurality of receiving stations, all controlled over a relatively small number of line wires from a central point or points.
  • the invention is particularly adaptable to the transmission and posting of varying-quotat'ons or rices of numerous items of exchange, stocks, nds or commodities, etc.-
  • the transmission of the quotations may be controlled from a central point or points and arrangements are provided whereby a pluralitv of brokers or others may be simultaneously provided withquotation service for the plurality of items posted.
  • the objects of our invention include the provision of apparatus and methods of using V such apparatus which are rapid, accurate an dependable in operation and which are relatively simple. Further and more specific objects,
  • the invention consists in the novel signaling methods, features, circuit arrangements and combinations of circuits and parts as. hereinafter described, but by way of example only, as being illustrative of certain preferred embodiments of the invention.
  • Fig. 1a comprises a schematic diagram showing the transmitting circuit arrangements of one embodiment of the invention.
  • Fig, 2 illustrates in perspective a transmitting apparatus cabinet together with a typical receiving station indicator cabinet features and advantages will more clearly appear 287,680, and in Switzerland April 5, 1927.
  • the apparatus-of this invention may be operated for example in conjunction with quotation boards or the like apparatus, such as shgwn-in the pending application of Robert L. Daine and Rene Guy, Serial No. 246,474, filed January 13,1928. Also if desired, the flexibility of the service rendered by the apparatus of 1115 lnvention may be greatly enanced by utilizing the invention covered by the patent of Robert L. Daine, No. 1 658 516, dated February 7, 1928, entitled Methods and apparatus forindicating notations or other items.
  • -A1so, certain e emental circuits, arrangements and devices embodied in the apparatus hereinafter described may be constructed as disclosed in Letters Patent and an application of Francois Favarger, as follows: British Patent No.
  • Fig. 16 comprises a schematic diagram as has been done, for example, in the apparatus disclosed in our co-pending application Ser. No. 258,219. filed March 1, 1928, entitled Electrical indicating apparatus.
  • Indicator units I riphery of this drum so that such numerals will be exhibited one at a time at the front of the indicating board when the drums 11 are rotated.
  • the drums may be conveniently rotated with a step-by-step movementin the particular example shown in Fig. 16', such .movement being always in the same direction regardless of whether the indicator is being actuated to exhibit a new quotation or isbeing restored to its normal or blank position.
  • the indicators may be actuated by electromagnets as at 12, each having a pair of coils as at 13 and 14.
  • the magnets 12 serve to actuate armatures as at 15, which in turn control a ratchet and pawl movement of any suitable well known type as at 16 for controlling the position of the drums 11.
  • the energizing coils 14 are arranged to energize the indicator.
  • the coils 13 are arranged to energize the indicator magnets to actuate the indicators when posting new quotations.
  • indicator magnets may thus be energized by electrical impulses to either actuate or restore the indicators, but in either case the indicator drums will move step-by-step in a clockwise direction as shown in Fig. 1?).
  • the restoration impulses will be interrupted by reason of the opening of the circuit of the coil 14 at a stop switch as at 17.
  • the stop switches 17 may be controlled by cam members as at 18, so shaped as to cause the switches 17 to be opened whenever the indicator drums are at their predetermined 4 normaY positions. For example.
  • the cam 18 as shown may be provided with a flat surface located at an angular position corresponding to the normal or blank space on the periphery of the indicatorjdrurn 11. Therefore when the drum arrives at this blank position. the movable contact of the switch 17 which may be resilient, will move to circuit opening position,,whereas at other times the cam will hold this contact member at its closed circuit position.
  • the switches 17 will be referred to as restoration stop x Receiving circuits
  • 6 of the indicator units as provided for an indicator cabinet, areillustrated in Fig. 16, these 6 units being arranged to exhibit the digits necessary for two different item quotations. However, 1t will be understood thatfor an indicator cabinet such as at 20, for posting 12 different quotations, a total of 36 indicator units would be provided.
  • the first operation is to choose the item, that is, the exchange item or the particular stock or commodity for which a new quotation is to be set up.
  • This choice may be effected by the operation of a well known form of rotatable step-by-step selector switch, as indicated at 25, and which may be controlled by groups of impulses transmitted over the line wire 21.
  • the switch 25 would of course have 12 positions (only three of which are indicated for simplicity) and at each such position a total of 6 contacts, as at 26, may be provided and arranged to cooperate with a corresponding number of contacts as at 27 provided upon the switcli arm 28.
  • the three contacts 26 corresponding to the three lead wires 29 onthe other hand, are arranged to cooperate with three of the contacts 27 which are connected respectively to three lead wires 31.
  • the lead wires 31 may terminate respectively at threerelay contacts as at 32. which by the operation of a relay 33 may be all connected together and to the line wire 23 over. which restoration impulses may be transmitted.
  • the line wire 22 may provide a common return circuit extending to the transmitter from all of the indicator units and may be connected to the indicator unit magnets at the point of juncture of the two coils 13 and 14 in the manner shown, a typical connection for this purpose being indicated at 34.
  • the line wire 22 may also provide a return circuit connection for the relay 33, a lead wire 35 being provided for such purpose.
  • the line wire 22 might of course be replaced by a grounded return circuit connection, but to clarify the disclosure, the line wire 22 is here indicated.
  • a ground return is indicated at 36 for the selector circuit of line wire 21 and thereby the independence of this circuit from the actuation circuits is made clearly apparent.
  • the selector switch 25 inv the manner above described is first actuated by a number of impulses sent over the line wire 21, sufiicient to move the switch arm 28 and its contacts 27 into operative relationship with the contacts 26 at the switch position corresponding to the chosenitem. Thereupon it is desirable to first restore the indicators for this chosen item, to a normal setting in order that there may be no cumulative errors in the event that the previous settings were incorrect and also in order to facilitate rapid and accurate transmission ofthe new quotation. Therefore a sufiicient'numher of impulses (for example, 11) is transmitted from the transmitter over the restoration circuit line wire 23 to insure the returning to normal of each of the three chosen indicators, regardless of the previous setting. These restoration impulses energize the relay 33 and thus also energize the three circuits of the lead wires 31 and .29,
  • each of the three indicators are advanced step-b v-step until they all arrive at positions to indicate their fblanks.
  • the return circuit of-these restoration impulses is provided by the line wire 22 or its equivalent.
  • circuits for the indicators for the other items posted at the receiving station are connected in an obvious manner to'the contacts corresponding to those at 26, but at other positions of the selector switch 25.
  • the manner in'which lead wires may be extended to other receiving stations or other indicator panels or cabinets is also indicated in Fig. 1b.
  • Transmitter selector circuits a control relay therefor as at 40.
  • the general function of these parts is to transmit a number of selector impulses corresponding to the particular selector key 38 which may be operated. Such impulses are generated by the device 37 and the number transmitted over the line wire 21 is controlled by the counting switch '39 which is arranged to move step-bystep in unison with the selector switches 25 at the various receiving stations as above described.
  • Selector zmpulee generator The selector impulse generator at 37 may comprise a suitable motor as at 41 for operating a rotatable switch controlling member 42.
  • the member 42 is designed to rotate in the direction indi'cated by the arrow, so-that once during each revolution it will engage a member 43, causing contacts at 44 to be closed. Also, once during each revolutionof the member 42 and at predetermined times after the closing of the contacts 44, this member is arranged to engage a detent 45 for causing a pair of contacts at 46 to be momentarily moved to open circuit position.
  • the circuits are arranged so that during the interval between the closing of the contacts 44 and the opening of the contacts 46.
  • an electrical impulse is generated and applied to acircuitconnection 47 in a manner hereinafter described, the duration of such impulse being equal to the time required for the rotatable member 42 to travel throughthat part of its revolu- 46.
  • the speed of the motor 41 may of .course' be suitably governed in a well known.
  • the relative positions of the members 43 and 45 may be so fixed as to provide the desired interval which is a measure of the impulse duration.
  • the impulse gene'rator may be controlled by a relay as at 48, which may have three contact switches 49, and 51. The operation and function of these switches in conjunction with the contacts at 44and 46, will be explained hereinafter.
  • Each of the selector keys 38 may comprise a depressible button for operating normally open switch contacts as at 52. When one of the keys is depressed,
  • key #1 which corresponds to the first items posted at the-receiving stations, this will cause the first pair of contact springs as at 52 to bebrought into closed circuit position, which has theefi'ect of applying a ground connection from the ground 58 to one of the contact segments as at 59 on the impulse counter 39.
  • the keys 38 may be arranged and mechanically interlocked by a suitable device, as schematically indicated at 60, whereby when one of the keys is depressed, any key which has been previously depressed will be restored to its normal position.
  • the interlocking device between the keys of each bank of keys may be of any suitable and well known form used in adding machines, such for example as that shown in Vincent 1,002,-
  • the operation of the entire selector impulse transmitting arrangement will now be described. It may be first assumed that key #1 has been pressed during a previous operation of the system. At this time the-motor 41 and the relay 48 above referred to will not be energized. However, the relay 40 will be energized and a motor starting circuit con-' trolled through relay contacts at 61 will therefore be normally open, since the relay 40 being normally energized will hold the contacts 61 in open circuit position as shown.
  • the circuit of relay 40 may comprise a ground and battery as at 62, coil of relay 40, contact'brush 63 of the impulse counter 39, contact segment 59 of the impulse counter, lead wire 64, switch contacts 52 and the ground return 58.
  • This circuit is also the rela 48 to ick u b wa of a circuit y P P y 3 connection 69 and a. ground return at 70.
  • the contacts at 49 of the relay 48 will closed, establishing a temporary stick circuit for the relay 48 running from the ground 70 through the coil of relay 48, contacts 49, lead wire 71, through contacts 46', lead wires 68. and 66, contacts at 61 to the battery and ground at 65.
  • the relay 48 will close its contacts at 50, thus establishing a battery connection for the motor and the lead wire 68 independently of the relay contacts 61.
  • This independent battery circuit runs from the motor through lead wire 68 contacts at 50 and lead wire 72 to battery and ground at 65.
  • the motor is kept in operation so long as the relay 48 remains energized and independently of the breaking of the circuit at contact 61. Therefore, in the event that the contact 61 should be moved to open circuit position at a moment when a certain impulse from the device 37 is but partially completed, such opening of the contact 61 will not prevent the completion of such impulse.
  • clipped impulses either at the starting or the ending of the transmission of the group of selector impulses will be prevented, thus insuring impulses of suflicient duration to properly actuate the selector switches, including the first and last impulses of each selector impulse group.
  • the relay 48 as energized in the manner above described will also close a circuit through its contacts at 51, which connects the battery and ground as at 65 through the con nection wire 72 to the wire 47.
  • An impulse is thereby applied to the wire 47 and to the connected line wire 21, such impulse being of i a duration equal to the length of time that the relay 48 remains picked up.
  • Each of such impulses serves to advance through one step an electromagnetic stepping device as at 73 of the'impulse counter 39, and also advances one step in unison. each of the receiving station selector switches 25.
  • the construction of the stepping device 73 may be of any suitable known form, such for example as disclosed in the Favarger patents and application above referred to, and therefore need not be here described in detail.
  • the selecting impulse initiated in the manner above described will be terminated when the rotating member 42 engages the detent 45 for opening the contacts at 46. This of course momentarily releases the stick circuit of the relav 48. permitting the relay to drop out. If the operator has chosen item #2 and has pressed key #2 of the bank pf keys 38, a ground connection accordingly Wlll L have been applied to a contact segment 74 and the first selector impulse will have caused the impulse counter brush 68 to come into engagement with the contact 74, thus energizing the relay 40 and causing its contacts 61 to open. In that event the transmitter selector circuits will now be in normal condition such that the actuation impulses may betransmitted.
  • Transmitter actuation circuits The operation and arrangement of the transmitter actuation circuits, including also the means for transmitting the restoration impulses, as shown in the upper por-, tion of Fig. 1a will now be described in detail.
  • a source of current may be provided at 75 operatively connected to the transmitter circuits through a cut-out switch as at 76 rious normally closed circuits.
  • An impulse generator may be provided at 79 somewhat similar in operation and construction to the impulse generator 37 above described. 7
  • the impulse generator 79 may have a rotatable member 80 operated by a motor 81. 'l;he motor 81 it will be observed a is connected across the busses 77 and 7 8, so
  • the member 80 is rotated whenever the switch 7 6 is closed.
  • the member 80 acts to 'intermittently close the circuit through a pair of contacts 82 at short intervals, in the same manner that the contacts at 44 are closed with the impulse generator above described.
  • contacts at 83 are caused to be intermittently opened for short intervals by the member80 similar to the action of the contacts 46 above described.
  • the restoration key 84 serves to close a circuit through its contacts 85 and I 85, such circuit running from the current bus 78 through the coil of a relay 87, connection wire 88, contacts and 86, connect-ion wire 89 to contacts 82, and when the member 80 closes the contacts 82 for a short interval, this circuit is completed through connection wires 90 and 91 to the current bus 7 7
  • the relay 87 thereupon becomes energized by the current passing through this circuit.
  • Relay 87 thus picks up and closes its contacts at 92 and '93.
  • the contacts 92 provide a temporary stick circuit for the relay, such circuit extending from current bus 78, through the relay coil, contacts 92, connection wire 94, connection wire 95, thence through the contacts 83 andwires 90 and 91 to the current bus 77.
  • This stick circuit remains established, thus maintaining the relay picked up'un til the revolving member 80 opens the contacts at 83, thus opening thecircuit of relay 87 and permitting it to drop out.
  • its contacts 93 close a circuit from current bus 77, through connection wires 91 and 96, contacts 93 to line wire 23, "H
  • the transmission of indicator actuation im-' puZses may be controlled by three impulse counters 97, 98 and 99. These impulse counters may-be all driven in unison on a shaft 100 by a suitable stepping device as at 101 operating in a manner similar to the operaremaining 10 segments as at 104 correspond respectively to the digits 1-9 andO on the indicator drumsl
  • actuating keys 105, 106 and 107 are groupsof actuating keys 105, 106 and 107, respectively (the actuating keys106 and 107 have been omitted forsimplicity).
  • Each of these actuating keys is provided with a circuit connection as at 108 running between contacts as at 109 and correspondlng segments as at 104 of the corresponding impulse counters.
  • the keys 105, etc. are adapted to cooperate with tiltable contact bars as at 110, 111 and 112. These contact bars in turn are adapted to normally rest in circuit making position upon contacts 113, 114 and 115 respectively, which in turn are connected to the current bus J 7
  • tiltable contact bars as at 110, 111 and 112.
  • the three impulse counters cause groups ofim pulses to be transmitted over the three line wires 24 respectively, such groups including.
  • a mechanical resetting device may be provided in the form of a rod 116, which is movable longitudinally to .theright,
  • a handle 117 by a handle 117 and may be operatively connected to the contact bars'110, etc., as at 118, in a manner whereby the bars may one of all be tilted back to normal the keys to be raised.
  • the impulse counters 97, 98 and 99 may also be accompanied by relays as at 119, 120 and 121 respectively, each having two sets of contacts 122-123, 124125, 126127.
  • An additional relay common to all three of the impulse counters may be provided at 128 having two sets of contacts 129 and 130.
  • a relay 131 may be provided having two sets of contacts at at 132 and 133.
  • each of the relays 119, 120 and 121 is deenergized, whereupon contacts 122, 124 and 126, which were normally closed, will now be openedand contacts 123,125 and 127, which were normally open, will now be closed.
  • connectionwire is not energized at this time.
  • the operator may press the starting ke 134. This serves to connect the current 1 us 77 with a connection wire 137 running to a magnet 138 of the impulse counter stepping device 101, and thence-by way of a connection wire 139 to current bus 78. Until this time relay 128 has been normally picked up, a circuit being closed through itscoil from current bus 78, through a connection wire 140, thence through each of the normal impulse counter contacts 102 and the impulse counter brushes as at 141, and a connection wire 142 running to current bus 77. However, upon the momentary energization of the magnet 138 by the.
  • the impulse counter brushes 141 will break thecircuit connections to nor- V thiirelay 131 to pick up an ing of thecontacts 83, the opening of the-lat- Thereupon the contacts 129 and 130 of this relay will become closed.
  • the purpose of contact 129 will be described hereinafter.
  • the closing of contact 130 prepares a circuit from current bus 78, through contacts 130, thence throughthe coil of relay 131 to the normally opened contacts 82, thence through connection wires 90 and 91 to current bus 77 Upon the momentary closingzo'f the contacts 82 by reason of the rotation ofthe member this circuit will be coin leted, causing close a temporar stick circuit through its contacts 132,
  • connection wires and 91 to cnrrentbns 77 The relay 131 therefore remains energized during the interval between the closlng of contacts 82 and the openter contacts serving to. open the temporary stick circuit. Meanwhile, during the time that this relay is energized, its contacts 133 being closed serve to complete a circuit from current bus 77, connection wire. 91, through contacts 133, connection wire 136, thence continue to apply and to the stepping magnet 138 in theabove through each of thecontact makers 123, and 127 to the three line wires 24. Therefore, during thisinterval that the relay 131 is picked u an actuation impulse will be transmitte over each of the three line wires 24. This impulse passingthrough the connection wire 136 may also be conducted to the stepping magnet 138 by way ofa connection wire 143. e
  • relay 128 will continue to be deenergized 'and its contacts at will remain closed, thus permitting theimpulse generator 79 to successively repeat its cycle .of operations and impulses to the wire 136 described manner until such time as the brushes 141 have been stepped around through one complete revolution and back over the three "line wires impulse counters arrivesv at its contact seg-' ment corresponding to its key which has been to the normal contacts as at 102, whereupon the apparatus will be restored to normal condition. However, during this stepping action, impulses will continue to be transmitted 24 until each of the pressed. Of course, when one of the impulse counter brushes 141 arrives at the segment corresponding to.
  • relay128 is reenergized, thus stopping the further generation of impulses the'impulse counters 97, 98 and 99 from upon arrival of the by reason of the opening of its contact 130.
  • contact 129 will also be open, thus releasing the stick circuit of the re- 'lay's119, 120 and 121. Thereupon the key restoring member 117 ⁇ maybe operated, which restores the entire transmitter to condition ready for the next operation.
  • An 'electromagnetically operated brokers board comprising a great plurality of digit indicating drums each movable to numerous positions to exhibit the various -possible quotations of numerous stocks, commodities, or other items as quoted in a market or markets, impulse operated electromagnetic actuating means for each drum, means controlled at a distant oint for selecting a parf indicators to the exclu-- sion of others, impulse transmitting means common to'said lurality of indicators for transmitting a suili to the electromagnetic actuating means of said selected indicators to insure restoration of the same to a normal position regardless of the previous setting, and means operable as each indicator moves into normal position to render the remainderof said number of impulses ineffective to "move such indicator beyond normal position.
  • said receiving mechanism comprising a pluralityof groups of indicators, electromagnetic operating means for each indicator, a restoring circuit and an actuating circuit for each operating means, the terminals of the circuits of such group of indicators being. arranged in groups, and the said actuating circuit for 'cient number of impulsesgroups of terminals being arranged in a series, a multi-position switch member adapted to be positioned by impulses over one of said line wlres, and a group of contacts on such switch member for cooperation with groups of terminal contacts and in electrical connection with'the other of said line Wires.
  • a transmitting mechanism comprising a plurality of groups of indica-' tors, electromagnetic operating means for each indicator, a restoring circuit and an actuating circuit for each operati'ng means, the terminals of the circuits of each group of indicators being arranged in groups and the groups of terminals being arranged in a series, a multi-position switch member adapted to be positioned by impulses over one of said line wires, a group of contacts on such switch member for cooperation with said groups of terminal contacts, the contacts cooperating with the terminals of said actuating circuits being connected to an equal number of other line wires, and an electrical connection between the contacts cooperating with the terminals of the restoring circuits and another of said line wires.
  • a transmitting mechanism comprising a plurality of groupsof indicators, electromagnetic operating means for each indicator, a restoring circuit and an each operating means, the terminals of the circuits of each group of indicators being arran ed in groups and the groups of terminals series, a multi-position switch member adapted to be positioned by impulses over one of said line wires, a group of contacts on such switchmember said groups of terminal contacts,-the contacts cooperating with the terminals of said actuating circuits being connected to an equal number of other line wires, and an impulsing relay responsive to impulses over another f said line wires and arranged to simultaneously cause impulses over each of the contacis cooperating with said restoring circm s.
  • a receiving mechamsm comprising'a plurality of groups of indlcators, electromagnetic operating means for each indicator, two circuits for each electromagnetic means for operating the indicator forwardly, means for breaking one of said circuits as the indicator is operated forwardty to home position, a selecting means, a
  • said receiving mechanism comprising .a plurality of groups of indicators, electromagnetic means for operating each indicator orwardly, a circuit for each electromagnetic means, impulsing means in the receiving mechanism, a selecting means in the receiving mechanism for connecting the circuits of the electromag- "netic means of any group ofindicators to said impulsing means, means in the transmitting mechanism for controlling said selecting means, and means for opening said circuits as said selected indicators move into home position.
  • a receiving station including a group of electromagnetically operated indicators
  • a transmitting station including a plurality of impulse counters equal in number to the number of indicators in the group, an equal number of transmission channels extending from the transmission station to the receiving station, an:impulse enerator for 'ving such counters a comp ete rotation, anks of keys for connecting said channels to said generator, means for setting the generator in operation and stepping said counters, and means for disconnecting respective channels from said generator as the respective counters are moved into positions corresponding to the depressed keys.
  • a receiving station includin a group of electromagnetically operated in cators
  • a transmitting station including a lurality of impulse counters ual in numr'to the number of indicators m'the grou an equal number of transmission channe extending from the transmission station to the-receiving station, an impulse generator for 'ving such counters a complete rotation, b 'of keys for connecting said channels to said generator, meanslfor setting the genorator in operation and stepping said counters, relays controlled by said counters for disconnecting respective channels 'from said generator as the counters are moved into position corresponding, to the ke s depressed, holding circuits closed by said relay and means for opening said holding circuits as the counters move mto home position.

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  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Relay Circuits (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Selective Calling Equipment (AREA)
US267680A 1927-04-05 1928-04-05 Signaling apparatus and method Expired - Lifetime US1852994A (en)

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CH288300X 1927-04-05

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US (1) US1852994A (nl)
BE (1) BE350214A (nl)
DE (1) DE614880C (nl)
FR (1) FR652021A (nl)
GB (1) GB288300A (nl)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2682044A (en) * 1948-12-30 1954-06-22 Automatic Elect Lab Indicator resetting system
US2922984A (en) * 1955-12-20 1960-01-26 Autophon Ag Electrically operated signalling system
US2939020A (en) * 1950-10-11 1960-05-31 Northrop Corp Control pulse generating means for radio control systems

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE965409C (de) * 1949-09-13 1957-06-06 Siemens Ag Einrichtung zur Meldung von Zahlen fuer die Zugnummernmeldung bei Eisenbahnen
DE1023373B (de) * 1953-11-03 1958-01-23 Wilhelm Kengelbach Feuer-, Unfall- und Sicherheits-meldeanlage

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2682044A (en) * 1948-12-30 1954-06-22 Automatic Elect Lab Indicator resetting system
US2939020A (en) * 1950-10-11 1960-05-31 Northrop Corp Control pulse generating means for radio control systems
US2922984A (en) * 1955-12-20 1960-01-26 Autophon Ag Electrically operated signalling system

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DE614880C (de) 1935-06-20
GB288300A (en) 1929-07-03
FR652021A (fr) 1929-03-02
BE350214A (nl)

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