FR529161A - Système téléphonique d'intercommunication - Google Patents
Système téléphonique d'intercommunicationInfo
- Publication number
- FR529161A FR529161A FR529161A FR529161DA FR529161A FR 529161 A FR529161 A FR 529161A FR 529161 A FR529161 A FR 529161A FR 529161D A FR529161D A FR 529161DA FR 529161 A FR529161 A FR 529161A
- Authority
- FR
- France
- Prior art keywords
- intercom system
- telephone intercom
- telephone
- intercom
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR529161T | 1920-07-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR529161A true FR529161A (fr) | 1921-11-24 |
Family
ID=8922527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR529161A Expired FR529161A (fr) | 1920-07-06 | 1920-07-06 | Système téléphonique d'intercommunication |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR529161A (fr) |
-
1920
- 1920-07-06 FR FR529161A patent/FR529161A/fr not_active Expired
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