CA452038A - Systeme de signaux sonores a frequence - Google Patents
Systeme de signaux sonores a frequenceInfo
- Publication number
- CA452038A CA452038A CA452038A CA452038DA CA452038A CA 452038 A CA452038 A CA 452038A CA 452038 A CA452038 A CA 452038A CA 452038D A CA452038D A CA 452038DA CA 452038 A CA452038 A CA 452038A
- Authority
- CA
- Canada
- Prior art keywords
- voice frequency
- frequency ringing
- ringing system
- voice
- ringing
- 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 |
|---|---|---|---|
| CA452038T |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA452038A true CA452038A (fr) | 1948-10-19 |
Family
ID=35569766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA452038A Expired CA452038A (fr) | Systeme de signaux sonores a frequence |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA452038A (fr) |
-
0
- CA CA452038A patent/CA452038A/fr not_active Expired
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