CA530739A - Telephone systems - Google Patents

Telephone systems

Info

Publication number
CA530739A
CA530739A CA530739A CA530739DA CA530739A CA 530739 A CA530739 A CA 530739A CA 530739 A CA530739 A CA 530739A CA 530739D A CA530739D A CA 530739DA CA 530739 A CA530739 A CA 530739A
Authority
CA
Canada
Prior art keywords
telephone systems
telephone
systems
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
CA530739A
Other languages
French (fr)
Inventor
G. Pearce James
Davison Alan
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.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric Co Ltd
Publication date
Application granted granted Critical
Publication of CA530739A publication Critical patent/CA530739A/en
Expired legal-status Critical Current

Links

CA530739A Telephone systems Expired CA530739A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA530739T

Publications (1)

Publication Number Publication Date
CA530739A true CA530739A (en) 1956-09-25

Family

ID=35684500

Family Applications (1)

Application Number Title Priority Date Filing Date
CA530739A Expired CA530739A (en) Telephone systems

Country Status (1)

Country Link
CA (1) CA530739A (en)

Similar Documents

Publication Publication Date Title
CA580092A (en) Switching systems
CA530739A (en) Telephone systems
CA522332A (en) Telephone systems
CA524594A (en) Telephone systems
CA524631A (en) Telephone systems
CA525662A (en) Telephone systems
CA521856A (en) Telephone systems
CA533592A (en) Telephone systems
CA521394A (en) Telephone systems
CA533984A (en) Telephone system
CA530442A (en) Telecommunication systems
CA532978A (en) Telecommunication systems
CA527080A (en) Telephone answering systems
CA522215A (en) Intercommunication telephone systems
CA532449A (en) Automatic telephone systems
CA524054A (en) Automatic telephone systems
CA522080A (en) Pulsating-current systems
AU213260B2 (en) Improvements in telephone systems
AU205812B2 (en) Improvements in telephone systems
AU209194B2 (en) Improvements in telephone systems
AU210879B2 (en) Improvements in telephone systems
AU212284B2 (en) Improvements in telephone systems
AU215161B2 (en) Improvements in telephone systems
AU215332B2 (en) Improvements in telephone systems
CA546624A (en) Telephone systems