CA403972A - Telephone signalling system - Google Patents

Telephone signalling system

Info

Publication number
CA403972A
CA403972A CA403972A CA403972DA CA403972A CA 403972 A CA403972 A CA 403972A CA 403972 A CA403972 A CA 403972A CA 403972D A CA403972D A CA 403972DA CA 403972 A CA403972 A CA 403972A
Authority
CA
Canada
Prior art keywords
signalling system
telephone signalling
telephone
signalling
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
CA403972A
Other languages
French (fr)
Inventor
Wicks John
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.)
Nortel Networks Ltd
Original Assignee
Northern Electric Co Ltd
Publication date
Application granted granted Critical
Publication of CA403972A publication Critical patent/CA403972A/en
Expired legal-status Critical Current

Links

CA403972A Telephone signalling system Expired CA403972A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA403972T

Publications (1)

Publication Number Publication Date
CA403972A true CA403972A (en) 1942-04-07

Family

ID=35414420

Family Applications (1)

Application Number Title Priority Date Filing Date
CA403972A Expired CA403972A (en) Telephone signalling system

Country Status (1)

Country Link
CA (1) CA403972A (en)

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