BE446491A - - Google Patents

Info

Publication number
BE446491A
BE446491A BE446491DA BE446491A BE 446491 A BE446491 A BE 446491A BE 446491D A BE446491D A BE 446491DA BE 446491 A BE446491 A BE 446491A
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 BE446491A publication Critical patent/BE446491A/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
    • H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
    • H04Q1/4426—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using two or more signalling frequencies, transmitted in succession or simultaneously

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electrotherapy Devices (AREA)
BE446491D 1941-06-21 BE446491A (xx)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2474234X 1941-06-21

Publications (1)

Publication Number Publication Date
BE446491A true BE446491A (xx)

Family

ID=19874318

Family Applications (1)

Application Number Title Priority Date Filing Date
BE446491D BE446491A (xx) 1941-06-21

Country Status (3)

Country Link
US (1) US2474234A (xx)
BE (1) BE446491A (xx)
FR (1) FR882438A (xx)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2045735A (en) * 1934-05-26 1936-06-30 American Telephone & Telegraph Radio receiving circuits

Also Published As

Publication number Publication date
FR882438A (fr) 1943-06-02
US2474234A (en) 1949-06-28

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