CH314171A - Automatic device to prevent unwanted teleselective telephone connections - Google Patents

Automatic device to prevent unwanted teleselective telephone connections

Info

Publication number
CH314171A
CH314171A CH314171DA CH314171A CH 314171 A CH314171 A CH 314171A CH 314171D A CH314171D A CH 314171DA CH 314171 A CH314171 A CH 314171A
Authority
CH
Switzerland
Prior art keywords
teleselective
automatic device
prevent unwanted
telephone connections
telephone
Prior art date
Application number
Other languages
Italian (it)
Inventor
Caramella Vittorio
Original Assignee
Caramella Vittorio
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 Caramella Vittorio filed Critical Caramella Vittorio
Publication of CH314171A publication Critical patent/CH314171A/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)
CH314171D 1951-07-14 1952-07-09 Automatic device to prevent unwanted teleselective telephone connections CH314171A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT314171X 1951-07-14

Publications (1)

Publication Number Publication Date
CH314171A true CH314171A (en) 1956-05-31

Family

ID=11233607

Family Applications (1)

Application Number Title Priority Date Filing Date
CH314171D CH314171A (en) 1951-07-14 1952-07-09 Automatic device to prevent unwanted teleselective telephone connections

Country Status (3)

Country Link
BE (1) BE512819A (en)
CH (1) CH314171A (en)
FR (1) FR1067890A (en)

Also Published As

Publication number Publication date
FR1067890A (en) 1954-06-21
BE512819A (en)

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