GB525676A - Improvements in or relating to signal receivers for telephone systems - Google Patents

Improvements in or relating to signal receivers for telephone systems

Info

Publication number
GB525676A
GB525676A GB14372/39A GB1437239A GB525676A GB 525676 A GB525676 A GB 525676A GB 14372/39 A GB14372/39 A GB 14372/39A GB 1437239 A GB1437239 A GB 1437239A GB 525676 A GB525676 A GB 525676A
Authority
GB
United Kingdom
Prior art keywords
relay
signal circuit
signals
signal
relays
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
Application number
GB14372/39A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Philips Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB525676A publication Critical patent/GB525676A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Relay Circuits (AREA)
GB14372/39A 1938-05-16 1939-05-13 Improvements in or relating to signal receivers for telephone systems Expired GB525676A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE525676X 1938-05-16

Publications (1)

Publication Number Publication Date
GB525676A true GB525676A (en) 1940-09-02

Family

ID=6552697

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14372/39A Expired GB525676A (en) 1938-05-16 1939-05-13 Improvements in or relating to signal receivers for telephone systems

Country Status (4)

Country Link
US (1) US2265203A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE434364A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR854758A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB525676A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2489391A (en) * 1943-12-09 1949-11-29 Photoswitch Inc Thermally controlled electric relay
US2456427A (en) * 1944-11-28 1948-12-14 Gen Electric Protective system for electric motors
US2483408A (en) * 1945-03-26 1949-10-04 Standard Telephones Cables Ltd Relay circuit
US2516361A (en) * 1945-08-21 1950-07-25 Gen Railway Signal Co Voice frequency signal device
US2608608A (en) * 1946-01-29 1952-08-26 Ipsophon Patentgesellschaft A Electrical relay system
US2943588A (en) * 1946-04-22 1960-07-05 Martin G Sateren Control system for torpedo
FR963277A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1947-02-21 1950-07-05
US2543309A (en) * 1947-10-15 1951-02-27 Andersson Ivan Means for automatically operating a number of electric relays or solenoids at a preset time
US2534895A (en) * 1948-02-28 1950-12-19 Westinghouse Electric Corp Auxiliary power system for aircraft
US2592825A (en) * 1948-09-03 1952-04-15 Gen Electric Co Ltd Frequency difference indicator
US2689279A (en) * 1949-09-21 1954-09-14 Maurice J Noregaard Electric switch
US2687500A (en) * 1949-12-06 1954-08-24 Westinghouse Electric Corp Circuit interrupter
US2706258A (en) * 1951-06-16 1955-04-12 Bell Telephone Labor Inc Voltage testing circuit
US2776383A (en) * 1952-04-21 1957-01-01 Robotron Corp Multi-function electronic timing circuit
US2773221A (en) * 1952-08-12 1956-12-04 Columbia Broadcasting Syst Inc Timing circuit
US3048660A (en) * 1958-07-31 1962-08-07 Bell Telephone Labor Inc Telephone pay station system
NL273286A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1961-01-07
US3475561A (en) * 1965-09-29 1969-10-28 Superior Continental Corp Telephone carrier system having selfcontained independently attachable line tap units

Also Published As

Publication number Publication date
US2265203A (en) 1941-12-09
BE434364A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR854758A (fr) 1940-04-24

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