CA31720A - Telephone exchange signalling - Google Patents
Telephone exchange signallingInfo
- 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
Links
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) |
-
0
- CA CA000031720A patent/CA31720A/en not_active Expired
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