BE441868A - - Google Patents
Info
- Publication number
- BE441868A BE441868A BE441868DA BE441868A BE 441868 A BE441868 A BE 441868A BE 441868D A BE441868D A BE 441868DA BE 441868 A BE441868 A BE 441868A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Amplifiers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB27372/39A GB535386A (en) | 1939-10-06 | 1939-10-06 | Improvements in electric wave repeater circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE441868A true BE441868A (US07321065-20080122-C00020.png) |
Family
ID=10258538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE441868D BE441868A (US07321065-20080122-C00020.png) | 1939-10-06 |
Country Status (5)
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3283073A (en) * | 1962-11-30 | 1966-11-01 | Webster Electric Co Inc | Intercommunication system and eavesdropping preventing means therefor |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1880889A (en) * | 1931-05-25 | 1932-10-04 | Bell Telephone Labor Inc | Signal transmission system |
| US2034703A (en) * | 1934-08-04 | 1936-03-24 | Bell Telephone Labor Inc | Transmission control in signaling systems |
| US2066325A (en) * | 1935-10-22 | 1937-01-05 | Bell Telephone Labor Inc | Transmission control in two-way signaling system |
| US2143407A (en) * | 1937-08-05 | 1939-01-10 | Bell Telephone Labor Inc | Gain control circuits |
| BE430480A (US07321065-20080122-C00020.png) * | 1937-10-05 |
-
0
- BE BE441868D patent/BE441868A/xx unknown
-
1939
- 1939-10-06 GB GB27372/39A patent/GB535386A/en not_active Expired
-
1941
- 1941-02-27 FR FR870441D patent/FR870441A/fr not_active Expired
-
1942
- 1942-04-02 CH CH236317D patent/CH236317A/fr unknown
-
1947
- 1947-08-19 US US769368A patent/US2577792A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FR870441A (fr) | 1942-03-11 |
| CH236317A (fr) | 1945-01-31 |
| US2577792A (en) | 1951-12-11 |
| GB535386A (en) | 1941-04-08 |
