FR2147558A5 - - Google Patents
Info
- Publication number
- FR2147558A5 FR2147558A5 FR7206546A FR7206546A FR2147558A5 FR 2147558 A5 FR2147558 A5 FR 2147558A5 FR 7206546 A FR7206546 A FR 7206546A FR 7206546 A FR7206546 A FR 7206546A FR 2147558 A5 FR2147558 A5 FR 2147558A5
- Authority
- FR
- France
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
- H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA119434A CA938039A (en) | 1971-07-29 | 1971-07-29 | Tone-generating circuit for energizing an electro-acoustic transducer |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2147558A5 true FR2147558A5 (en) | 1973-03-09 |
Family
ID=4090468
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7206546A Expired FR2147558A5 (en) | 1971-07-29 | 1972-02-25 |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE777618A (en) |
CA (1) | CA938039A (en) |
FR (1) | FR2147558A5 (en) |
IT (1) | IT947704B (en) |
-
1971
- 1971-07-29 CA CA119434A patent/CA938039A/en not_active Expired
- 1971-12-31 BE BE777618A patent/BE777618A/en unknown
-
1972
- 1972-02-18 IT IT2075272A patent/IT947704B/en active
- 1972-02-25 FR FR7206546A patent/FR2147558A5/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
IT947704B (en) | 1973-05-30 |
BE777618A (en) | 1972-04-17 |
CA938039A (en) | 1973-12-04 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |