US2498695A - Telegraph receiver - Google Patents
Telegraph receiver Download PDFInfo
- Publication number
- US2498695A US2498695A US744010A US74401047A US2498695A US 2498695 A US2498695 A US 2498695A US 744010 A US744010 A US 744010A US 74401047 A US74401047 A US 74401047A US 2498695 A US2498695 A US 2498695A
- Authority
- US
- United States
- Prior art keywords
- tube
- conducting
- code
- cathode
- tubes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/26—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using discharge tubes
- G11C11/28—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using discharge tubes using gas-filled tubes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L17/00—Apparatus or local circuits for transmitting or receiving codes wherein each character is represented by the same number of equal-length code elements, e.g. Baudot code
- H04L17/16—Apparatus or circuits at the receiving end
- H04L17/30—Apparatus or circuits at the receiving end using electric or electronic translation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
Definitions
- This invention relates to telegraph receivers.
- a telegraph receiver mustin general comprise a means for timing the periods occupied by the Successive elements of the .code. This ;is generally done by means of rotating mechanical parts and great accuracy of manufacture is necessary for these parts.
- a receiver fora telegraph code comprising. a time base derived by electric discharge services for timing the in,- tervals occupied by the elements of said code, and means for determining the kind of elements received in each of said intervals.
- a receiver fora telegraph code comprising means for generating an evenly spaced series of electric impulses, means .ior timing the intervals occupied by the elements of said code by the intervals between saidimpulses and means for determining the ,kind .of element received in each of said intervals.
- a receiver comprises an electric impulse generator for generating, ,an ,evenly spaced series of impulses, ,means responsive to the start element of a code signal for starting said impulse generator into. operation, and means for timing the intervals occupied :by :the elements of said code by the intervals betweensaid impulses and means for determining the :kindpf element being received at the ,middlewof each of said intervals.
- the receiver according to the in.- vention comprises a chain of gas filled electric discharge devices which are caused to'be rendered conducting sequentially by sequentialimpulses and in the case of a receiverfor start. stop teleprinter codes the electric impulse generator that is started into operation by the receipt of the start element of a code delivers an impulse to the electric discharge device corresponding to the start element of the codeaf-ter a delay-equal to half the period of time allotted to the start element.
- Each electric discharge device causes the succeeding device to become conducting when the next impulse is applied so that these successive devices become conducting at the midpoint of the successive elements and the time interval to be occupied by the signal is determined by the chain of devices.
- each said code a chain of .gasfilled .electricdischarge devices, one for each element of the code, means for setting the successive devices .of each chain so as to cause .each to .be rendered conducting only .upon the simultaneous occurrence vof the preceding device in the chain .being conducting and an elementiof, the required kind being received means for causing..-successi ve elements of the code to be applied to successivedevices in the chain and means operative. upon the last device in the chain :becoming conducting .to .cause the receipt of the code to'become operative.
- the codes .used in such a system should be chosen @sothat the earlier occurring elements areas far as possible common to a plurality of codes and :the several chains of electric discharge devices .are combined to the extent that devices representing elements common to .-a plurality of codes, are provided and are connected so as to ,be common to the like plurality-pf chains ofsuchdevices.
- astart-stop teleprinter codeusing five code elements thirty two different combinations are possible. There are thus thirty two chains of electric discharge devices required but the number of such devices is reduced by arranging one such device for the start element which is common: to all the combinations.
- This device is connected to ,a pair of devices forthe second element ,of the code, one for a marking element and one for a spacing element.
- the start hecomes conducting .in response to the start element and impresses on each device of the said pair of a potential tending to make it conducting.
- the first code element When the first code element is received it impresses a second potential on that one of the pair that corresponds to the-kind of element.
- the two potentials added together make one of the pair conducting.
- Each device of this pair is connected to twofurther devices for the next element and so on in geometrical progression. In this way any particular code received progresses along only one chain of electric discharge devices and only one device corresponding to the last element of the code combination becomes conducting and indicates the receipt of that particular code combination.
- this completed chain of electric discharges in one sense times the telegraph code, it is preferred to use a separate means forthis purpose and in the preferred form this separate means consists of a separate pilot chain of electric discharge devices rendered conducting sequentially by the application thereto of an evenly spaced series of impulses.
- Figs. 1 and 2 together form one circuit diagram, Fig. 1 showing the pilot chain of tubes and a receiver for one predetermined code and Fig. 2 the circuit of the impulse generator and the telegraph relays receiving signals from the line;
- Fig. 3 shows diagrammatically how tubes of the receiver may be arranged for a certain number .of code combinations
- Fig. 4 shows diagrammatically the arrangement of tubes of the receiver for a complete 5- unit code receiver.
- Fig. 1 there are shown two trains of three electrode gas-filled cold-cathode tubes.
- the first or pilot chain consists of seven tubes I 'I, one for each element of the code. These tubes are connected each to the next in the chain in a manner similar to that shown in U. S. Patent No. 2,421,005, but modified in an important respect.
- Tube I comprises an anode 8, a control electrode 9' and a cold cathode II].
- a positive po-' tential must be applied to the anode 8 with respect to the cathode. So long as this potential is 130 volts or more, the minimum ionisation current produced by a voltage of about 70 volts between control electrode 9 and cathode I0 is sufiicient to cause current to flow betWeen anode 8, and cathode IEI.
- the potential applied between anode and cathode diminishes below 130 volts, the ionisation current between control electrode 9 and cathode III and consequently the potential applied between them, that is needed'to render the tube conducting, increases rapidly.
- resistances II and I2 are proportioned to give a voltage drop of twice that previously provided between cathode and earth and the junction point of these resistances is connected (over a resistance I4 as previously) to the control electrode of tube 2.
- the fall in the nominal voltage applied tov the control electrode 9 of tube 2 due to a given fall in mains voltage is then less than before.
- the voltage drop between the source l3 and the anode of tube I is reduced so that tube I is more easily extinguished by tube 2 becoming conducting.
- the voltage-drop across tube I when conducting is about 70 volts so that the anode of tube I is about volts above ground potential.
- the voltage applied between the anode and cathode of tube 2 is held, even if the mains voltage varies, above the value at which minimum potential difference between control electrode and cathode will cause the tube i ecome conducting.
- tube I In the initial condition of the circuit of Figs. 1 and 2, tube I is conducting and a potential difference is impressed from its cathode circuit between the control electrode and cathode of tube 2. This potential difference is about 35 volts, which is insufficient to cause the tube to become conducting, the potential difference required for this purpose being about '70 volts.
- the incoming line I5 Fig. 2 is connected over windings of telegraph relays I6 and IT to ground. As in the normal, non-signalling condition of line I5 marking potential is impressed thereon at the transmitting station, the contacts I8 and I9 of these relays are in marking position.
- the cathode of tube I Fig. l is connected over a conductor 20 to the marking contact of contacts I9 and thus through a condenser 2I and ground. Condenser 2I is thus kept charged.
- Fig. 2 shows the circuits of an impulse generator and the means by which it is started into operation.
- the impulse generator comprises two pentodes 22 and 23 connected in well known manner as a multivibrator.
- the anode potentials are supplied from a source stabilised by means of a neon-tube stabiliser 24.
- the normal grid potentials are adjusted by means of potentiometers 25 and 26, the sliding contact on 25 serving to adjust the frequency and that on 26 the relative times of operation of the two tubes.
- the impulses are derived from the grids of pentodes 22 and 23, these grids being connected over respective condensers to the grids of triodes 21, 28 so that the changes of potential on the grids of pentodes 22 and 23 being thus differentiated to produce positive impulses on conductors 29 and 38 connected to the anodes of those triodes.
- the multivibrator is held in non-operating condition by the cathode of tube 22 being normally connected to positive potential.
- a three electrode cold cathode tube Si is normally conducting and current therefore flows through resistance 32 connected to the cathode thereof, the positive end of this resistance being connected to the cathode of pentode 22.
- the spacing contact of contacts I 9 is connected to earth over the primary of a step-up transformer 35, the secondary of which is connected to the control electrode of tube 33.
- condenser 2I is discharged through the primary of transformer 35.
- the resultant potential across the secondary of this transformer 35 is impressed between control electrode and cathode of tube 33 and is sufiicient to ionise the gap between those anes oes electrodes and :theitube 33 becomes conducting.
- the .periodiof the multivibrator may belsetsso that this :pulse occurs milliseconds after :the commencement of -its operation and thus at itheim'id-point of fthe periodof milliseconds .ior :the :start element of theincoming signal (for a teleprinter. signalling speed of 50 bands).
- '1 correspond .to. the different elements. of. a .startestopfive unit ,teleprinter code.
- Tube 2 corresponds tothe .start element of the code...and tubes v3 to .-the. code elements.
- the cathode circuit of tube It deaconnected over conductor-:39 tto :the. 2901117130.]. electrode. sofas. :col-d cathode tube 40 (Fig. 2) which control electrode also :connected :toaconduetor
- the impulse generator applies; anxlimpulse JtO..:-CQD-d1l0t.l' 123i ten milliseconds after. each impulse aplll'iedto to the connection/between the anodes :of tubes .34
- Tube- 2 . is made conducting-when the-,startelement of a teleprinter signal .is received, as .described above, and a .potential is thereby impressed not only between. control electrode and cathode of tube .3-asdescribed above, but also between controlelectrode and cathodeof .tubedt.
- the second impulseon conductor ,29 occurs ,at an interval of 20. millisecondsafterthefirstimpulse, i. e. in the middle of the interval allotted to the first code elementpf .the received signal.
- Conductor 2.9 is connected to the moving tongue ofcontacts t8 and ifat this momentama-rking impulse is being .rec,eived,.s,o that contacts i8. are in marking position, this impulse is applied over conductoril to the control electrode of tube-43.
- the potentialdue to this impulse added .to the potential impressed vfrom the cathode circuit of tube.2 causes tube .43tobecome.conducting.
- the cathode circuit .oftube .43 impresses apotential on'the-control electrode .of tube .44. ..If, on .the occurrence of the next impulse on conductorifl, contacts .18 are *inspacing position, the-potential of this impulse .is. applied iover condudtorfifl .to the ;control electrode of tubes, .and' .tube 44 becomes 'conducting'and tube'43 is made nonconducting.
- tube 43 would not have been made conducting. In this case tube 43 would not be made conducting upon any subsequent impulse. Also if tube 43 has been made conducting because the first code element is a mark, but the second code element is also a mark so that on the occurrence of the third impulse on conductor 29 contacts l8 are in marking position, tube 44 would not be made conducting. Tube 44 will however be made conducting on the occurrence of a subsequent spacing element forming part of the code combination.
- An additional cold-cathode tube 59 is provided having its anode connected to the anodes of tubes 43 41.
- the control electrode of tube 59 is connected to the conductor 42, so that when, at the end of the period allotted to the receipt of a start-stop teleprinter code tube i is made conducting by an impulse from the secondary of trans-- former 4
- anode connection ensures that any of the tubes 43 41 that may then be conducting is made non-conducting.
- Tube 59 will be rendered. non-conducting during the receipt of a subsequent code combination if any of the tubes 43 41 then becomes conducting.
- Fig. 3 shows diagrammatically how this can be done for four and eight codes respectively.
- Each of the circles represents a cold-cathode tube.
- Fig. 3 The portion of Fig. 3 below the dashed line shows the additional tubes needed to extend the arrangement to the receipt of eight codes, and from this it will be clear how the arrangement could be extended for the receipt of any number of codes permitted by the number of code elements used, that is 92 for a five-unit code.
- the letters placed in Fig. 3 opposite each tube for the final element of the code are the letters represented by the particular chain of devices that ends in that element.
- a complete teleprinter receiver may be constructed, as shown in Fig. 4 which is composed of electric discharge devices, apart from the two receiving telegraph relays I6 and Il and the relays such as 55 which can be arranged either to efiect the printing of a character or to perform any desired supervisory or indicating function. There are no rotating parts and mechanical wear is reduced to a minimum.
- the start tube 2 is shown in Fig. 4 and from this figure the connections of the remaining tubes will be clear.
- the multivibrator of Fig. 2 may be set by means of the sliding contact on resistance 26 so that the relative periods during which it is in the respective conditions of stability are equal and this adjustment has been assumed in the foregoing description.
- an impulse occurs on conductor 29 after the lapse of 10 milliseconds (assuming that the slider on resistance 25 is set for a total period of 20 milliseconds).
- the sliding contact on resistance 26 allows however of the adjustment of the initial period to suit distortion in the line [5, this adjustment corresponding to that which is termed orientation adjustment with mechanical teleprinters.
- the impulses on conductor 29 follow one another after equal periods of time, the length of which depends on the frequency of the multivibrator, determined by the adjustment of the sliding contact on resistance 25. What is claimed is:
- a receiver for predetermined telegraph codes comprising for each said code a chain of gasfilled electric discharge devices, one chain for each element of the code; an electric impulse generator for generating a series of regularly repeated impulses, means for applying impulses from said generator to successive devices ofs'aid chains upon receipt of a code element the required kind, means to apply an impulse fr m a preceding device in a chain simultaneouslylwith said last named means, said successive devic"; in said chains adapted to be rendered conducting in accordance with the corresponding code lement, means operative upon the last devic'e'j in an operated chain becoming conducting to indicate the receipt of the code element, and means connected to each chain for restoring the devices thereof to non-conducting condition at the end of the period allotted to the receipt of the cod 2.
- a receiver as claimed in claim 1 comprising means for timing impulses from said impulse "generator to occur at the mid-points of the period allotted to the receipt of successive elements of the code.
- a receiver as claimed in claim 2 in which a pilot chain of gas-filled electric dischargedevices is provided, one for each element of. the code, comprising means for rendering said j ,devices conducting successively, for periods equal to the periods of the successive elements of the code and means operative at the end of the period allotted to the receipt of a code combination/for stopping said impulse generator and for restoring the receiver into a condition to receive a further code combination.
- a receiver as claimed in claim 3, in which said means for generating electric impulses or said electric impulse generator comprises a multivibrator, and means for differentiating the changes of potential upon an electrode of said multivibrator to produce a series of impulses.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Hardware Design (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Electrotherapy Devices (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
- Surgical Instruments (AREA)
- Recording Measured Values (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5153/46A GB636668A (en) | 1946-02-19 | 1946-02-19 | Improvements in or relating to telegraph receivers |
Publications (1)
Publication Number | Publication Date |
---|---|
US2498695A true US2498695A (en) | 1950-02-28 |
Family
ID=10276538
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US744010A Expired - Lifetime US2498695A (en) | 1946-02-19 | 1947-04-25 | Telegraph receiver |
US241727A Expired - Lifetime US2668870A (en) | 1946-02-19 | 1951-08-14 | Printing telegraph receiver |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US241727A Expired - Lifetime US2668870A (en) | 1946-02-19 | 1951-08-14 | Printing telegraph receiver |
Country Status (7)
Country | Link |
---|---|
US (2) | US2498695A (id) |
BE (1) | BE471306A (id) |
CH (1) | CH284954A (id) |
DE (2) | DE914739C (id) |
ES (1) | ES176831A1 (id) |
FR (2) | FR942202A (id) |
GB (2) | GB636668A (id) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2575268A (en) * | 1948-05-31 | 1951-11-13 | Griffith Ronald George | Printing telegraph system |
US2613267A (en) * | 1950-01-23 | 1952-10-07 | James D Durkee | Printing telegraph system |
US2622153A (en) * | 1948-10-15 | 1952-12-16 | Teletype Corp | Multiplex telegraph system utilizing electronic distributors |
US2718589A (en) * | 1950-06-29 | 1955-09-20 | Bell Telephone Labor Inc | Radio relay system |
US2749386A (en) * | 1952-02-08 | 1956-06-05 | Int Standard Electric Corp | Telegraph repeaters |
US2780751A (en) * | 1948-06-11 | 1957-02-05 | Ridler Desmond Sydney | Gas discharge tubes and circuit arrangements therefor |
US3166735A (en) * | 1958-10-06 | 1965-01-19 | Gen Electric | Code selectors for selective calling systems |
US3171098A (en) * | 1961-02-08 | 1965-02-23 | Motorola Inc | Binary selective calling system |
US3252142A (en) * | 1962-09-10 | 1966-05-17 | Codamite Corp | Code receiver responsive to plural binary sub-group |
US3335406A (en) * | 1958-10-06 | 1967-08-08 | Gen Electric | Code selectors for selective calling systems |
US3399350A (en) * | 1964-05-18 | 1968-08-27 | Sylvania Electric Prod | Self-timing decoder for pulse code wherein code structure is subject to restraints |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE537174A (id) * | 1952-06-02 | |||
US2720832A (en) * | 1952-09-26 | 1955-10-18 | Ibm | Indexable type wheel with reset means |
US2771599A (en) * | 1953-03-06 | 1956-11-20 | Marchant Calculators Inc | Readout mechanism |
US2776618A (en) * | 1953-06-11 | 1957-01-08 | Hughes Aircraft Co | Printing cylinders for high-speed printing systems |
US2744955A (en) * | 1953-08-24 | 1956-05-08 | Rca Corp | Reversible electronic code translators |
US2843840A (en) * | 1953-12-09 | 1958-07-15 | Applied Science Corp Of Prince | Numerical tabulator |
US2807664A (en) * | 1953-12-31 | 1957-09-24 | Rca Corp | Information translating system |
US2844650A (en) * | 1954-03-02 | 1958-07-22 | Hoffman Electronics Corp | Teletypewriter systems or the like |
DE1016742B (de) * | 1955-04-14 | 1957-10-03 | Siemens Ag | Anordnung zum Auswerten einer bestimmten Folge von Schrittkombinationen, insbesondere von auf einem Lochstreifen gespeicherten Fernschreibzeichen |
US2945091A (en) * | 1955-06-10 | 1960-07-12 | Olivetti Corp Of America | Decoding-printing apparatus |
US2885475A (en) * | 1955-08-09 | 1959-05-05 | Olivetti Corp Of America | Decoding and printing apparatus |
DE1186099B (de) * | 1955-11-16 | 1965-01-28 | SCM Corporation, Syracuse, N. Y. (V. St. A.) | Steueranordnung für eine Teilnehmerstelle einer Fernschreibverbindung |
US2927960A (en) * | 1956-03-29 | 1960-03-08 | Teletype Corp | Telegraph system |
DE1036912B (de) * | 1956-10-24 | 1958-08-21 | Werk Fuer Fernmeldewesen Veb | Sender- und/oder empfaengerseitiger Umsetzer von Telegrafiezeichen in Fernschreibgeraeten |
US2950672A (en) * | 1957-12-11 | 1960-08-30 | Ibm | Printing directory |
US2973507A (en) * | 1958-09-02 | 1961-02-28 | Collins Radio Co | Call recognition system |
US3101664A (en) * | 1961-02-06 | 1963-08-27 | Clary Corp | Printer |
US3100440A (en) * | 1961-04-07 | 1963-08-13 | Metrodynamics Corp | Line printer |
US3304858A (en) * | 1963-12-23 | 1967-02-21 | Mathatronics Inc | Electromechanical printing system for digital systems |
US3415184A (en) * | 1966-04-12 | 1968-12-10 | Olivetti & Co Spa | High speed serial printing device for teleprinters, accounting machines and data processing equipments |
US3771442A (en) * | 1972-01-11 | 1973-11-13 | Penril Data Communications Inc | Zero-lock print wheel apparatus |
US3807300A (en) * | 1972-10-25 | 1974-04-30 | Ibm | Inspection terminal |
US4122770A (en) * | 1976-04-23 | 1978-10-31 | Yamato Scale Company, Ltd. | Series printer |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US897662A (en) * | 1906-12-06 | 1908-09-01 | Alfred Moss Roberts | Telegraphic selective system. |
US1068869A (en) * | 1912-09-06 | 1913-07-29 | Claude M Edwards | Selective telegraph system. |
US2099065A (en) * | 1935-03-15 | 1937-11-16 | American Telephone & Telegraph | Distributor device |
GB512827A (en) * | 1938-02-22 | 1939-09-26 | Standard Telephones Cables Ltd | Improvements in or relating to electric signalling systems |
US2411441A (en) * | 1944-07-28 | 1946-11-19 | Teleregister Corp | Telegraph receiving distributor system |
US2412642A (en) * | 1943-08-25 | 1946-12-17 | Bell Telephone Labor Inc | Electronic telegraph transmitter distributor |
US2430547A (en) * | 1943-10-28 | 1947-11-11 | Rca Corp | Start-stop electronic regenerative telegraph signal repeater |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2523300A (en) * | 1946-08-17 | 1950-09-26 | Standard Telephones Cables Ltd | Printer telegraph circuit |
US2557964A (en) * | 1946-08-17 | 1951-06-26 | Standard Telephones Cables Ltd | Error detector for telegraph printers |
US2540654A (en) * | 1948-03-25 | 1951-02-06 | Engineering Res Associates Inc | Data storage system |
-
0
- BE BE471306D patent/BE471306A/xx unknown
-
1946
- 1946-02-19 GB GB5153/46A patent/GB636668A/en not_active Expired
-
1947
- 1947-02-15 ES ES176831A patent/ES176831A1/es not_active Expired
- 1947-02-18 FR FR942202D patent/FR942202A/fr not_active Expired
- 1947-02-18 CH CH284954D patent/CH284954A/fr unknown
- 1947-04-25 US US744010A patent/US2498695A/en not_active Expired - Lifetime
-
1950
- 1950-08-21 GB GB20649/50A patent/GB676588A/en not_active Expired
- 1950-10-01 DE DEST2527A patent/DE914739C/de not_active Expired
-
1951
- 1951-08-10 FR FR63212D patent/FR63212E/fr not_active Expired
- 1951-08-14 US US241727A patent/US2668870A/en not_active Expired - Lifetime
- 1951-08-22 DE DEI4524A patent/DE911736C/de not_active Expired
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US897662A (en) * | 1906-12-06 | 1908-09-01 | Alfred Moss Roberts | Telegraphic selective system. |
US1068869A (en) * | 1912-09-06 | 1913-07-29 | Claude M Edwards | Selective telegraph system. |
US2099065A (en) * | 1935-03-15 | 1937-11-16 | American Telephone & Telegraph | Distributor device |
GB512827A (en) * | 1938-02-22 | 1939-09-26 | Standard Telephones Cables Ltd | Improvements in or relating to electric signalling systems |
US2412642A (en) * | 1943-08-25 | 1946-12-17 | Bell Telephone Labor Inc | Electronic telegraph transmitter distributor |
US2430547A (en) * | 1943-10-28 | 1947-11-11 | Rca Corp | Start-stop electronic regenerative telegraph signal repeater |
US2411441A (en) * | 1944-07-28 | 1946-11-19 | Teleregister Corp | Telegraph receiving distributor system |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2575268A (en) * | 1948-05-31 | 1951-11-13 | Griffith Ronald George | Printing telegraph system |
US2780751A (en) * | 1948-06-11 | 1957-02-05 | Ridler Desmond Sydney | Gas discharge tubes and circuit arrangements therefor |
US2622153A (en) * | 1948-10-15 | 1952-12-16 | Teletype Corp | Multiplex telegraph system utilizing electronic distributors |
US2613267A (en) * | 1950-01-23 | 1952-10-07 | James D Durkee | Printing telegraph system |
US2718589A (en) * | 1950-06-29 | 1955-09-20 | Bell Telephone Labor Inc | Radio relay system |
US2749386A (en) * | 1952-02-08 | 1956-06-05 | Int Standard Electric Corp | Telegraph repeaters |
US3166735A (en) * | 1958-10-06 | 1965-01-19 | Gen Electric | Code selectors for selective calling systems |
US3335406A (en) * | 1958-10-06 | 1967-08-08 | Gen Electric | Code selectors for selective calling systems |
US3171098A (en) * | 1961-02-08 | 1965-02-23 | Motorola Inc | Binary selective calling system |
US3252142A (en) * | 1962-09-10 | 1966-05-17 | Codamite Corp | Code receiver responsive to plural binary sub-group |
US3399350A (en) * | 1964-05-18 | 1968-08-27 | Sylvania Electric Prod | Self-timing decoder for pulse code wherein code structure is subject to restraints |
Also Published As
Publication number | Publication date |
---|---|
DE911736C (de) | 1954-05-20 |
GB676588A (en) | 1952-07-30 |
US2668870A (en) | 1954-02-09 |
CH284954A (fr) | 1952-08-15 |
FR63212E (fr) | 1955-09-12 |
ES176831A1 (es) | 1947-03-16 |
BE471306A (id) | |
DE914739C (de) | 1954-07-08 |
FR942202A (fr) | 1949-02-02 |
GB636668A (en) | 1950-05-03 |
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