IT1025854B - Rivelatore per apparecchi telefonici - Google Patents

Rivelatore per apparecchi telefonici

Info

Publication number
IT1025854B
IT1025854B IT2963574A IT2963574A IT1025854B IT 1025854 B IT1025854 B IT 1025854B IT 2963574 A IT2963574 A IT 2963574A IT 2963574 A IT2963574 A IT 2963574A IT 1025854 B IT1025854 B IT 1025854B
Authority
IT
Italy
Prior art keywords
detector
telephone devices
telephone
devices
Prior art date
Application number
IT2963574A
Other languages
English (en)
Italian (it)
Original Assignee
Sodeco Compteurs De Geneve
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.)
Filing date
Publication date
Application filed by Sodeco Compteurs De Geneve filed Critical Sodeco Compteurs De Geneve
Application granted granted Critical
Publication of IT1025854B publication Critical patent/IT1025854B/it

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/677—Preventing the dialling or sending of predetermined telephone numbers or selected types of telephone numbers, e.g. long distance numbers
    • 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
    • H04M17/023—Circuit arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
IT2963574A 1973-11-21 1974-11-20 Rivelatore per apparecchi telefonici IT1025854B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1644673A CH571795A5 (fr) 1973-11-21 1973-11-21

Publications (1)

Publication Number Publication Date
IT1025854B true IT1025854B (it) 1978-08-30

Family

ID=4417418

Family Applications (1)

Application Number Title Priority Date Filing Date
IT2963574A IT1025854B (it) 1973-11-21 1974-11-20 Rivelatore per apparecchi telefonici

Country Status (4)

Country Link
BE (1) BE822413A (fr)
CH (1) CH571795A5 (fr)
FR (1) FR2251968A1 (fr)
IT (1) IT1025854B (fr)

Also Published As

Publication number Publication date
DE2365240B2 (de) 1976-08-05
CH571795A5 (fr) 1976-01-15
FR2251968B3 (fr) 1977-08-19
DE2365240A1 (de) 1975-05-28
FR2251968A1 (en) 1975-06-13
BE822413A (fr) 1975-03-14

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