FR825777A - Mechanism to limit the call possibilities of a telephone device - Google Patents

Mechanism to limit the call possibilities of a telephone device

Info

Publication number
FR825777A
FR825777A FR825777DA FR825777A FR 825777 A FR825777 A FR 825777A FR 825777D A FR825777D A FR 825777DA FR 825777 A FR825777 A FR 825777A
Authority
FR
France
Prior art keywords
limit
telephone device
possibilities
call
call possibilities
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
Fritz Marti
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 FR825777A publication Critical patent/FR825777A/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)
  • Transmission Devices (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephone Set Structure (AREA)
FR825777D 1936-08-19 1937-08-19 Mechanism to limit the call possibilities of a telephone device Expired FR825777A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH500971X 1936-08-19

Publications (1)

Publication Number Publication Date
FR825777A true FR825777A (en) 1938-03-14

Family

ID=4516927

Family Applications (1)

Application Number Title Priority Date Filing Date
FR825777D Expired FR825777A (en) 1936-08-19 1937-08-19 Mechanism to limit the call possibilities of a telephone device

Country Status (7)

Country Link
US (1) US2216850A (en)
BE (1) BE423200A (en)
CH (1) CH195491A (en)
DE (1) DE690679C (en)
FR (1) FR825777A (en)
GB (1) GB500971A (en)
NL (1) NL48597C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3284578A (en) * 1963-02-11 1966-11-08 Earl R Evans Direct-dialing long-distance telephone systems
US3358087A (en) * 1964-05-21 1967-12-12 Western Electric Co Telephone instrument dialing control device

Also Published As

Publication number Publication date
GB500971A (en) 1939-02-20
US2216850A (en) 1940-10-08
DE690679C (en) 1940-05-04
CH195491A (en) 1938-01-31
NL48597C (en)
BE423200A (en)

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