CA403972A - Telephone signalling system - Google Patents
Telephone signalling systemInfo
- 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
Links
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) |
-
0
- CA CA403972A patent/CA403972A/en not_active Expired
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