CA894941A - Telephone security device - Google Patents

Telephone security device

Info

Publication number
CA894941A
CA894941A CA894941A CA894941DA CA894941A CA 894941 A CA894941 A CA 894941A CA 894941 A CA894941 A CA 894941A CA 894941D A CA894941D A CA 894941DA CA 894941 A CA894941 A CA 894941A
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
CA894941A
Inventor
H. Ireland Rainseford
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.)
BOISSEVAIN MANUFACTURED PRODUCTS Ltd
Original Assignee
BOISSEVAIN MANUFACTURED PRODUCTS 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 BOISSEVAIN MANUFACTURED PRODUCTS Ltd filed Critical BOISSEVAIN MANUFACTURED PRODUCTS Ltd
Application granted granted Critical
Publication of CA894941A publication Critical patent/CA894941A/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)
CA894941A 1969-09-24 1969-09-24 Telephone security device Expired CA894941A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA62985 1969-09-24

Publications (1)

Publication Number Publication Date
CA894941A true CA894941A (en) 1972-03-07

Family

ID=4085712

Family Applications (1)

Application Number Title Priority Date Filing Date
CA894941A Expired CA894941A (en) 1969-09-24 1969-09-24 Telephone security device

Country Status (1)

Country Link
CA (1) CA894941A (en)

Similar Documents

Publication Publication Date Title
CA917327A (en) Telephone security device
CA956007A (en) Signalling device
CA851280A (en) Telephone security device
SU592908A1 (en) Ballast-compacting device
CA894941A (en) Telephone security device
CA953045A (en) Telephone auto-answering device
CA884552A (en) Security devices
CA863432A (en) Telephone security device
AU6473469A (en) Lock protecting device
CA954990A (en) Telephone security device
AU447466B2 (en) Telephone subset
AU446594B2 (en) Telephone subset
CA825269A (en) Telephone set
CA818976A (en) Key-operated setting device
CA805552A (en) Ship-unloading device
CA808852A (en) Eye-protecting device
CA814694A (en) Security-interviewer device
CA816523A (en) Bale-throwing device
AU434175B2 (en) Coupler-self-rejecting device
CA809865A (en) Slide-type fastening device
AU441285B2 (en) Telephone auto-answering device
AU404634B2 (en) Security device
CA828028A (en) Latch device
CA922030A (en) Telephone system
CA809747A (en) Telephone system