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BE467075A - - Google Patents

Info

Publication number
BE467075A
BE467075A BE467075DA BE467075A BE 467075 A BE467075 A BE 467075A BE 467075D A BE467075D A BE 467075DA BE 467075 A BE467075 A BE 467075A
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 BE467075A publication Critical patent/BE467075A/xx

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
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Telephonic Communication Services (AREA)
BE467075D 1944-02-23 BE467075A (xx)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3338/44A GB572002A (en) 1944-02-23 1944-02-23 Improvements in telephone or like signalling systems

Publications (1)

Publication Number Publication Date
BE467075A true BE467075A (xx)

Family

ID=9756430

Family Applications (1)

Application Number Title Priority Date Filing Date
BE467075D BE467075A (xx) 1944-02-23

Country Status (3)

Country Link
US (1) US2424452A (xx)
BE (1) BE467075A (xx)
GB (1) GB572002A (xx)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB654639A (en) * 1947-02-07 1951-06-27 Standard Telephones Cables Ltd Improvements in or relating to electric signalling systems
GB641888A (en) * 1947-02-07 1950-08-23 Standard Telephones Cables Ltd Improvements in or relating to electric signalling systems
US2566009A (en) * 1947-12-12 1951-08-28 Automatic Elect Lab Interexchange switching telephone system
DE1021016B (de) * 1955-04-29 1957-12-19 Standard Elektrik Ag Schaltungsanordnung fuer Fernmelde- und Fernwirkanlagen zur Signaluebertragung nach einem Frequenzkodesystem

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1881273A (en) * 1931-01-07 1932-10-04 Western Electric Co Telephone system
FR744153A (xx) * 1931-11-07 1933-04-13
US2310749A (en) * 1942-03-31 1943-02-09 Bell Telephone Labor Inc Singaling system
GB559016A (en) * 1942-07-28 1944-02-01 Automatic Telephone & Elect Improvements in or relating to telephone or like systems

Also Published As

Publication number Publication date
GB572002A (en) 1945-09-18
US2424452A (en) 1947-07-22

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