BE354435A - - Google Patents
Info
- Publication number
- BE354435A BE354435A BE354435DA BE354435A BE 354435 A BE354435 A BE 354435A BE 354435D A BE354435D A BE 354435DA BE 354435 A BE354435 A BE 354435A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Checking Fares Or Tickets At Control Points (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB25508/27A GB303086A (en) | 1927-09-27 | 1927-09-27 | Improvements in and relating to automatic or semi-automatic telephone systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE354435A true BE354435A (en:Method) |
Family
ID=10228818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE354435D BE354435A (en:Method) | 1927-09-27 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US1786480A (en:Method) |
| BE (1) | BE354435A (en:Method) |
| GB (1) | GB303086A (en:Method) |
-
0
- BE BE354435D patent/BE354435A/xx unknown
-
1927
- 1927-09-27 GB GB25508/27A patent/GB303086A/en not_active Expired
- 1927-11-25 US US235485A patent/US1786480A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US1786480A (en) | 1930-12-30 |
| GB303086A (en) | 1928-12-27 |