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NL235237A - - Google Patents

Info

Publication number
NL235237A
NL235237A NL235237DA NL235237A NL 235237 A NL235237 A NL 235237A NL 235237D A NL235237D A NL 235237DA NL 235237 A NL235237 A NL 235237A
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 NL235237A publication Critical patent/NL235237A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
NL235237D 1959-01-19 NL235237A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1112554X 1959-01-19

Publications (1)

Publication Number Publication Date
NL235237A true NL235237A (en)

Family

ID=19869411

Family Applications (2)

Application Number Title Priority Date Filing Date
NL124925D NL124925C (en) 1959-01-19
NL235237D NL235237A (en) 1959-01-19

Family Applications Before (1)

Application Number Title Priority Date Filing Date
NL124925D NL124925C (en) 1959-01-19

Country Status (2)

Country Link
DE (1) DE1112554B (en)
NL (2) NL235237A (en)

Also Published As

Publication number Publication date
DE1112554B (en) 1961-08-10
NL124925C (en)

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