NL53137C - - Google Patents

Info

Publication number
NL53137C
NL53137C NL53137DA NL53137C NL 53137 C NL53137 C NL 53137C NL 53137D A NL53137D A NL 53137DA NL 53137 C NL53137 C NL 53137C
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 NL53137C publication Critical patent/NL53137C/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M17/00—Prepayment of wireline communication systems, wireless communication systems or telephone systems
    • H04M17/02—Coin-freed or check-freed systems, e.g. mobile- or card-operated phones, public telephones or booths
    • 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
    • H04Q1/48—Induced-current signalling arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
NL53137D 1929-08-20 NL53137C (en))

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE621696X 1929-08-20
SE1845571X 1929-08-20
DE215253X 1938-12-15

Publications (1)

Publication Number Publication Date
NL53137C true NL53137C (en))

Family

ID=27183792

Family Applications (1)

Application Number Title Priority Date Filing Date
NL53137D NL53137C (en)) 1929-08-20

Country Status (1)

Country Link
NL (1) NL53137C (en))

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