CH571795A5 - - Google Patents

Info

Publication number
CH571795A5
CH571795A5 CH1644673A CH1644673A CH571795A5 CH 571795 A5 CH571795 A5 CH 571795A5 CH 1644673 A CH1644673 A CH 1644673A CH 1644673 A CH1644673 A CH 1644673A CH 571795 A5 CH571795 A5 CH 571795A5
Authority
CH
Switzerland
Application number
CH1644673A
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
Priority to CH1644673A priority Critical patent/CH571795A5/xx
Priority to DE19732365240 priority patent/DE2365240C3/de
Priority to FR7437927A priority patent/FR2251968A1/fr
Priority to IT2963574A priority patent/IT1025854B/it
Priority to BE150698A priority patent/BE822413A/fr
Publication of CH571795A5 publication Critical patent/CH571795A5/xx

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)
CH1644673A 1973-11-21 1973-11-21 CH571795A5 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CH1644673A CH571795A5 (fr) 1973-11-21 1973-11-21
DE19732365240 DE2365240C3 (de) 1973-11-21 1973-12-28 Detektor für Fernsprechstellen
FR7437927A FR2251968A1 (en) 1973-11-21 1974-11-18 Detector for figure in telephone number - limits public telephone operating area by blocking line
IT2963574A IT1025854B (it) 1973-11-21 1974-11-20 Rivelatore per apparecchi telefonici
BE150698A BE822413A (fr) 1973-11-21 1974-11-20 Detecteur pour postes telephoniques

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
CH571795A5 true CH571795A5 (fr) 1976-01-15

Family

ID=4417418

Family Applications (1)

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

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
FR2251968B3 (fr) 1977-08-19
DE2365240A1 (de) 1975-05-28
FR2251968A1 (en) 1975-06-13
BE822413A (fr) 1975-03-14
IT1025854B (it) 1978-08-30

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Legal Events

Date Code Title Description
PL Patent ceased
PL Patent ceased