NL58054C - - Google Patents

Info

Publication number
NL58054C
NL58054C NL58054DA NL58054C NL 58054 C NL58054 C NL 58054C NL 58054D A NL58054D A NL 58054DA NL 58054 C NL58054 C NL 58054C
Authority
NL
Netherlands
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 NL58054C publication Critical patent/NL58054C/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)
NL58054D 1938-05-20 NL58054C (fr)

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
NL58054C true NL58054C (fr)

Family

ID=10053070

Family Applications (1)

Application Number Title Priority Date Filing Date
NL58054D NL58054C (fr) 1938-05-20

Country Status (4)

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

Also Published As

Publication number Publication date
FR854916A (fr) 1940-04-27
GB516114A (en) 1939-12-22
BE434428A (fr)

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