BE481448A - - Google Patents

Info

Publication number
BE481448A
BE481448A BE481448DA BE481448A BE 481448 A BE481448 A BE 481448A BE 481448D A BE481448D A BE 481448DA BE 481448 A BE481448 A BE 481448A
Authority
BE
Belgium
Application number
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.)
Publication of BE481448A publication Critical patent/BE481448A/xx
Priority claimed from GB371247A external-priority patent/GB651457A/en

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)
  • Noise Elimination (AREA)
BE481448D 1947-02-07 BE481448A (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB371247A GB651457A (en) 1947-02-07 1947-02-07 Improvements in or relating to electric signalling systems
GB1160547A GB651461A (en) 1947-02-07 1947-04-30 Improvements in or relating to alternating current signalling systems

Publications (1)

Publication Number Publication Date
BE481448A true BE481448A (de)

Family

ID=32232341

Family Applications (1)

Application Number Title Priority Date Filing Date
BE481448D BE481448A (de) 1947-02-07

Country Status (4)

Country Link
US (1) US2577755A (de)
BE (1) BE481448A (de)
CH (2) CH272712A (de)
FR (2) FR65204E (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2712232A (en) * 1951-05-10 1955-07-05 Stewart Warner Corp Balancing apparatus
US2728852A (en) * 1951-07-26 1955-12-27 Moran Instr Corp Echo ranging apparatus
BE514053A (de) * 1951-09-10
US2985717A (en) * 1952-05-09 1961-05-23 Bell Telephone Labor Inc Carrier telegraph switchboard supervisory systems
US2901541A (en) * 1956-05-25 1959-08-25 Automatic Telephone & Elect Telegraph receivers
US3124658A (en) * 1958-02-28 1964-03-10 Input
US3133992A (en) * 1958-10-13 1964-05-19 Matthew C Dickman Automatic answering, recording and reproducing machine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE698170C (de) * 1938-03-29 1940-11-04 Siemens & Halske Akt Ges Tasteinrichtung fuer Wechselstromtelegrafie
CH214050A (de) * 1938-10-21 1941-03-31 Fides Gmbh Tasteinrichtung in einer Wechselstromtelegraphieanlage.
US2402058A (en) * 1941-06-25 1946-06-11 Hazeltine Research Inc Secrecy communication system
BE479786A (de) * 1941-09-15
US2310749A (en) * 1942-03-31 1943-02-09 Bell Telephone Labor Inc Singaling system
US2401404A (en) * 1942-08-29 1946-06-04 Rca Corp Electrical multiplying circuit
US2403540A (en) * 1943-04-23 1946-07-09 Rca Corp Reciprocal circuit
BE462165A (de) * 1944-12-04

Also Published As

Publication number Publication date
FR960660A (de) 1950-04-22
FR65204E (fr) 1956-02-07
CH272712A (de) 1950-12-31
CH274626A (de) 1951-04-15
US2577755A (en) 1951-12-11

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