CA31720A - Telephone exchange signalling - Google Patents

Telephone exchange signalling

Info

Publication number
CA31720A
CA31720A CA000031720A CA31720DA CA31720A CA 31720 A CA31720 A CA 31720A CA 000031720 A CA000031720 A CA 000031720A CA 31720D A CA31720D A CA 31720DA CA 31720 A CA31720 A CA 31720A
Authority
CA
Canada
Prior art keywords
telephone exchange
exchange signalling
signalling
telephone
exchange
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
CA000031720A
Other languages
French (fr)
Inventor
John A. Seely
Theodore N. Vail
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.)
Individual
Original Assignee
Individual
Publication date
Application granted granted Critical
Publication of CA31720A publication Critical patent/CA31720A/en
Expired legal-status Critical Current

Links

CA000031720A Telephone exchange signalling Expired CA31720A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA31720T

Publications (1)

Publication Number Publication Date
CA31720A true CA31720A (en) 1889-07-16

Family

ID=45148260

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000031720A Expired CA31720A (en) Telephone exchange signalling

Country Status (1)

Country Link
CA (1) CA31720A (en)

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