BE434428A - - Google Patents

Info

Publication number
BE434428A
BE434428A BE434428DA BE434428A BE 434428 A BE434428 A BE 434428A BE 434428D A BE434428D A BE 434428DA BE 434428 A BE434428 A BE 434428A
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 BE434428A publication Critical patent/BE434428A/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
    • H04Q1/4535—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 with an additional signal transmitted for voice protection

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
BE434428D 1938-05-20 BE434428A (xx)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1510238A GB516114A (en) 1938-05-20 1938-05-20 Improvements in or relating to alternating current signalling systems

Publications (1)

Publication Number Publication Date
BE434428A true BE434428A (xx)

Family

ID=10053070

Family Applications (1)

Application Number Title Priority Date Filing Date
BE434428D BE434428A (xx) 1938-05-20

Country Status (4)

Country Link
BE (1) BE434428A (xx)
FR (1) FR854916A (xx)
GB (1) GB516114A (xx)
NL (1) NL58054C (xx)

Also Published As

Publication number Publication date
FR854916A (fr) 1940-04-27
GB516114A (en) 1939-12-22
NL58054C (xx)

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