FR694716A - Improvements to telephone systems - Google Patents
Improvements to telephone systemsInfo
- Publication number
- FR694716A FR694716A FR694716DA FR694716A FR 694716 A FR694716 A FR 694716A FR 694716D A FR694716D A FR 694716DA FR 694716 A FR694716 A FR 694716A
- 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
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB13556/29A GB332956A (en) | 1929-05-01 | 1929-05-01 | Improvements in or relating to telephone systems |
Publications (1)
Publication Number | Publication Date |
---|---|
FR694716A true FR694716A (en) | 1930-12-06 |
Family
ID=10025074
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR694716D Expired FR694716A (en) | 1929-05-01 | 1930-04-29 | Improvements to telephone systems |
Country Status (3)
Country | Link |
---|---|
US (1) | US1889564A (en) |
FR (1) | FR694716A (en) |
GB (1) | GB332956A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2682576A (en) * | 1951-01-20 | 1954-06-29 | Irving H Selden | Telephone system |
US2805288A (en) * | 1953-11-12 | 1957-09-03 | Gen Dynamics Corp | Multi-office telephone system |
-
1929
- 1929-05-01 GB GB13556/29A patent/GB332956A/en not_active Expired
-
1930
- 1930-04-14 US US444022A patent/US1889564A/en not_active Expired - Lifetime
- 1930-04-29 FR FR694716D patent/FR694716A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB332956A (en) | 1930-08-01 |
US1889564A (en) | 1932-11-29 |
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