FR39002E - - Google Patents
Info
- Publication number
- FR39002E FR39002E FR39002DA FR39002E FR 39002 E FR39002 E FR 39002E FR 39002D A FR39002D A FR 39002DA FR 39002 E FR39002 E FR 39002E
- 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
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/0016—Arrangements providing connection between exchanges
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Relay Circuits (AREA)
- Exchange Systems With Centralized Control (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB21042/27A GB302200A (en) | 1927-08-09 | 1927-08-09 | Improvements in or relating to automatic or semi-automatic telephone systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR39002E true FR39002E (en) | 1931-08-25 |
Family
ID=10156190
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR39002D Expired FR39002E (en) | 1927-08-09 | ||
| FR702872D Expired FR702872A (en) | 1927-08-09 | 1928-08-09 | Telephone link systems between "step by step" offices and return control offices |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR702872D Expired FR702872A (en) | 1927-08-09 | 1928-08-09 | Telephone link systems between "step by step" offices and return control offices |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US1837003A (en) |
| FR (2) | FR702872A (en) |
| GB (2) | GB302200A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL71657C (en) * | 1940-06-11 | |||
| US2421717A (en) * | 1943-04-28 | 1947-06-03 | Kellogg Switchboard & Supply | Automatic telephone system |
| GB577648A (en) * | 1944-04-01 | 1946-05-27 | Automatic Telephone & Elect | Improvements in or relating to telephone systems |
| GB586380A (en) * | 1944-12-08 | 1947-03-17 | Automatic Telephone & Elect | Improvements in telephone systems |
-
0
- FR FR39002D patent/FR39002E/fr not_active Expired
-
1927
- 1927-08-09 GB GB21042/27A patent/GB302200A/en not_active Expired
- 1927-08-09 GB GB32131/28A patent/GB302217A/en not_active Expired
-
1928
- 1928-08-06 US US297610A patent/US1837003A/en not_active Expired - Lifetime
- 1928-08-09 FR FR702872D patent/FR702872A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB302217A (en) | 1928-12-10 |
| GB302200A (en) | 1928-12-10 |
| US1837003A (en) | 1931-12-15 |
| FR702872A (en) | 1931-04-18 |