BE447777A - - Google Patents

Info

Publication number
BE447777A
BE447777A BE447777DA BE447777A BE 447777 A BE447777 A BE 447777A BE 447777D A BE447777D A BE 447777DA BE 447777 A BE447777 A BE 447777A
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 BE447777A publication Critical patent/BE447777A/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
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
BE447777D 1941-11-03 BE447777A (en:Method)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL256713X 1941-11-03

Publications (1)

Publication Number Publication Date
BE447777A true BE447777A (en:Method)

Family

ID=19781342

Family Applications (1)

Application Number Title Priority Date Filing Date
BE447777D BE447777A (en:Method) 1941-11-03

Country Status (4)

Country Link
US (1) US2610255A (en:Method)
BE (1) BE447777A (en:Method)
CH (1) CH256713A (en:Method)
DE (1) DE865475C (en:Method)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL225651A (en:Method) * 1951-05-10
US2885667A (en) * 1955-07-06 1959-05-05 Curtis L Downey Display type communications system
US3209342A (en) * 1960-05-23 1965-09-28 Westinghouse Electric Corp Apparatus for detecting and indicating alarm conditions in a protected area

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2057868A (en) * 1936-10-20 Telephone system
US2072079A (en) * 1933-10-13 1937-03-02 Gen Railway Signal Co Centralized traffic controlling system for railroads
US2154776A (en) * 1935-12-16 1939-04-18 Ass Telephone & Telegraph Co Telephone system
GB489545A (en) * 1937-01-25 1938-07-25 Standard Telephones Cables Ltd Improvements in or relating to electrical communication systems
NL87334C (en:Method) * 1938-10-03
GB521419A (en) * 1938-11-18 1940-05-21 Siemens Brothers & Co Ltd Improvements relating to telephone systems
US2341746A (en) * 1940-04-15 1944-02-15 Automatic Elect Lab Telephone system
US2476343A (en) * 1940-12-13 1949-07-19 William W Wiseman Frequency displacement
US2320081A (en) * 1941-04-05 1943-05-25 Bell Telephone Labor Inc Telephone system
US2301961A (en) * 1941-12-04 1942-11-17 Bell Telephone Labor Inc Signaling system
US2375053A (en) * 1943-08-19 1945-05-01 Bell Telephone Labor Inc Signaling system
US2443198A (en) * 1946-09-06 1948-06-15 Max E Sallach Pulse selector unit

Also Published As

Publication number Publication date
US2610255A (en) 1952-09-09
DE865475C (de) 1953-02-02
CH256713A (de) 1948-08-31

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