CH233996A - Device for limiting the possibilities of calling a telephone device. - Google Patents

Device for limiting the possibilities of calling a telephone device.

Info

Publication number
CH233996A
CH233996A CH233996DA CH233996A CH 233996 A CH233996 A CH 233996A CH 233996D A CH233996D A CH 233996DA CH 233996 A CH233996 A CH 233996A
Authority
CH
Switzerland
Prior art keywords
possibilities
calling
limiting
telephone
telephone device
Prior art date
Application number
Other languages
French (fr)
Inventor
Sodeco Societe Des Comp Geneve
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
Publication of CH233996A publication Critical patent/CH233996A/en

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transmission Devices (AREA)
CH233996D 1942-11-18 1942-11-18 Device for limiting the possibilities of calling a telephone device. CH233996A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH586310X 1942-11-18

Publications (1)

Publication Number Publication Date
CH233996A true CH233996A (en) 1944-08-31

Family

ID=4521825

Family Applications (1)

Application Number Title Priority Date Filing Date
CH233996D CH233996A (en) 1942-11-18 1942-11-18 Device for limiting the possibilities of calling a telephone device.

Country Status (3)

Country Link
CH (1) CH233996A (en)
DE (1) DE878226C (en)
GB (1) GB586310A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1067482B (en) * 1958-11-14 1959-10-22 Arnstadt Fernmeldewerk Arrangement for restricted number switch in coin telephones

Also Published As

Publication number Publication date
DE878226C (en) 1953-06-01
GB586310A (en) 1947-03-14

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