FR2275948A1 - Appareils de telephone a sonneries interchangeables - Google Patents
Appareils de telephone a sonneries interchangeablesInfo
- Publication number
- FR2275948A1 FR2275948A1 FR7516846A FR7516846A FR2275948A1 FR 2275948 A1 FR2275948 A1 FR 2275948A1 FR 7516846 A FR7516846 A FR 7516846A FR 7516846 A FR7516846 A FR 7516846A FR 2275948 A1 FR2275948 A1 FR 2275948A1
- Authority
- FR
- France
- Prior art keywords
- telephone
- interchangeable
- ringing tone
- base
- sound generator
- 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.)
- Granted
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)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6239474U JPS5324167Y2 (fr) | 1974-05-30 | 1974-05-30 | |
JP7373074U JPS512114U (fr) | 1974-06-22 | 1974-06-22 | |
JP7421174U JPS514205U (fr) | 1974-06-26 | 1974-06-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2275948A1 true FR2275948A1 (fr) | 1976-01-16 |
FR2275948B1 FR2275948B1 (fr) | 1977-04-15 |
Family
ID=34799151
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7516846A Granted FR2275948A1 (fr) | 1974-05-30 | 1975-05-29 | Appareils de telephone a sonneries interchangeables |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2275948A1 (fr) |
-
1975
- 1975-05-29 FR FR7516846A patent/FR2275948A1/fr active Granted
Also Published As
Publication number | Publication date |
---|---|
FR2275948B1 (fr) | 1977-04-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |