FR50504E - Improvements to telephone systems - Google Patents
Improvements to telephone systemsInfo
- Publication number
- FR50504E FR50504E FR50504DA FR50504E FR 50504 E FR50504 E FR 50504E FR 50504D A FR50504D A FR 50504DA FR 50504 E FR50504 E FR 50504E
- Authority
- FR
- France
- Prior art keywords
- telephone systems
- telephone
- systems
- 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
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
- H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
- H04Q3/625—Arrangements in the private branch exchange
Landscapes
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR50504T | 1939-03-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR50504E true FR50504E (en) | 1940-12-26 |
Family
ID=8685501
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR50504D Expired FR50504E (en) | 1939-03-24 | 1939-03-24 | Improvements to telephone systems |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR50504E (en) |
-
1939
- 1939-03-24 FR FR50504D patent/FR50504E/en not_active Expired
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