FR891048A - Device preventing the successful completion of prohibited telephone calls - Google Patents

Device preventing the successful completion of prohibited telephone calls

Info

Publication number
FR891048A
FR891048A FR891048DA FR891048A FR 891048 A FR891048 A FR 891048A FR 891048D A FR891048D A FR 891048DA FR 891048 A FR891048 A FR 891048A
Authority
FR
France
Prior art keywords
telephone calls
successful completion
device preventing
prohibited
prohibited 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)
Inventor
Gerard-Francis Wittgenstein
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 filed Critical
Application granted granted Critical
Publication of FR891048A publication Critical patent/FR891048A/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
    • H04M17/026—Constructional features

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Measurement Of Distances Traversed On The Ground (AREA)
FR891048D 1941-08-06 1942-07-22 Device preventing the successful completion of prohibited telephone calls Expired FR891048A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH563931X 1941-08-06

Publications (1)

Publication Number Publication Date
FR891048A true FR891048A (en) 1944-02-24

Family

ID=4520480

Family Applications (1)

Application Number Title Priority Date Filing Date
FR891048D Expired FR891048A (en) 1941-08-06 1942-07-22 Device preventing the successful completion of prohibited telephone calls

Country Status (2)

Country Link
FR (1) FR891048A (en)
GB (1) GB563931A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3511939A (en) * 1967-03-20 1970-05-12 Tamura Electric Works Ltd Local-call pay telephone arranged for key-enabled toll calls

Also Published As

Publication number Publication date
GB563931A (en) 1944-09-06

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