CA994433A - Multifrequency tone detecting arrangement - Google Patents
Multifrequency tone detecting arrangementInfo
- Publication number
- CA994433A CA994433A CA239,887A CA239887A CA994433A CA 994433 A CA994433 A CA 994433A CA 239887 A CA239887 A CA 239887A CA 994433 A CA994433 A CA 994433A
- Authority
- CA
- Canada
- Prior art keywords
- detecting arrangement
- tone detecting
- multifrequency tone
- multifrequency
- arrangement
- 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
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA239,887A CA994433A (en) | 1973-04-11 | 1975-11-18 | Multifrequency tone detecting arrangement |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US349948A US3914557A (en) | 1973-04-11 | 1973-04-11 | Multifrequency tone detecting arrangement |
CA188,538A CA994484A (en) | 1973-04-11 | 1973-12-19 | Multifrequency tone detecting arrangement |
CA239,887A CA994433A (en) | 1973-04-11 | 1975-11-18 | Multifrequency tone detecting arrangement |
Publications (1)
Publication Number | Publication Date |
---|---|
CA994433A true CA994433A (en) | 1976-08-03 |
Family
ID=27163218
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA239,887A Expired CA994433A (en) | 1973-04-11 | 1975-11-18 | Multifrequency tone detecting arrangement |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA994433A (en) |
-
1975
- 1975-11-18 CA CA239,887A patent/CA994433A/en not_active Expired
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