FR868947A - Zone determination device, in telephone installations - Google Patents

Zone determination device, in telephone installations

Info

Publication number
FR868947A
FR868947A FR868947DA FR868947A FR 868947 A FR868947 A FR 868947A FR 868947D A FR868947D A FR 868947DA FR 868947 A FR868947 A FR 868947A
Authority
FR
France
Prior art keywords
determination device
zone determination
telephone installations
installations
telephone
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telephon Apparat Fabrik E Zwietusch and Co
Original Assignee
Telephon Apparat Fabrik E Zwietusch and Co
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 Telephon Apparat Fabrik E Zwietusch and Co filed Critical Telephon Apparat Fabrik E Zwietusch and Co
Application granted granted Critical
Publication of FR868947A publication Critical patent/FR868947A/en
Expired legal-status Critical Current

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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
FR868947D 1939-11-12 1940-12-31 Zone determination device, in telephone installations Expired FR868947A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET53058D DE719605C (en) 1939-11-12 1939-11-12 Zone determiners in telephone systems, especially for charge control in coin telephones with network group traffic

Publications (1)

Publication Number Publication Date
FR868947A true FR868947A (en) 1942-01-20

Family

ID=5832087

Family Applications (1)

Application Number Title Priority Date Filing Date
FR868947D Expired FR868947A (en) 1939-11-12 1940-12-31 Zone determination device, in telephone installations

Country Status (5)

Country Link
BE (1) BE439701A (en)
CH (1) CH219811A (en)
DE (1) DE719605C (en)
FR (1) FR868947A (en)
NL (1) NL54342C (en)

Also Published As

Publication number Publication date
BE439701A (en) 1940-12-31
DE719605C (en) 1942-04-23
NL54342C (en) 1943-04-15
CH219811A (en) 1942-02-28

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