CA954990A - Telephone security device - Google Patents

Telephone security device

Info

Publication number
CA954990A
CA954990A CA140,112A CA140112A CA954990A CA 954990 A CA954990 A CA 954990A CA 140112 A CA140112 A CA 140112A CA 954990 A CA954990 A CA 954990A
Authority
CA
Canada
Prior art keywords
security device
telephone security
telephone
security
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
CA140,112A
Other versions
CA140112S (en
Inventor
Richard G. Catlin
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.)
Bristol Aerospace Ltd
Original Assignee
Bristol Aerospace Ltd
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 Bristol Aerospace Ltd filed Critical Bristol Aerospace Ltd
Priority to CA140,112A priority Critical patent/CA954990A/en
Application granted granted Critical
Publication of CA954990A publication Critical patent/CA954990A/en
Expired legal-status Critical Current

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)
CA140,112A 1972-04-20 1972-04-20 Telephone security device Expired CA954990A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA140,112A CA954990A (en) 1972-04-20 1972-04-20 Telephone security device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA140,112A CA954990A (en) 1972-04-20 1972-04-20 Telephone security device

Publications (1)

Publication Number Publication Date
CA954990A true CA954990A (en) 1974-09-17

Family

ID=4093005

Family Applications (1)

Application Number Title Priority Date Filing Date
CA140,112A Expired CA954990A (en) 1972-04-20 1972-04-20 Telephone security device

Country Status (1)

Country Link
CA (1) CA954990A (en)

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