BE386269A - - Google Patents
Info
- Publication number
- BE386269A BE386269A BE386269DA BE386269A BE 386269 A BE386269 A BE 386269A BE 386269D A BE386269D A BE 386269DA BE 386269 A BE386269 A BE 386269A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/58—Anti-side-tone circuits
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Springs (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3949/31A GB372400A (en) | 1931-02-07 | 1931-02-07 | Improvements relating to telephone instrument circuits |
| GB3238/34A GB425566A (en) | 1931-02-07 | 1934-01-31 | Improvements in or relating to telephone instrument circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE386269A true BE386269A (en) | 1932-03-31 |
Family
ID=32109232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE386269D BE386269A (en) | 1931-02-07 | 1932-02-06 |
Country Status (5)
| Country | Link |
|---|---|
| US (2) | US1919314A (en) |
| BE (1) | BE386269A (en) |
| FR (1) | FR732067A (en) |
| GB (3) | GB372400A (en) |
| NL (1) | NL35830C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2417067A (en) * | 1947-03-11 | Telephone substation circuit | ||
| US2548723A (en) * | 1945-07-13 | 1951-04-10 | Kellogg Switchboard & Supply | Telephone set hook-switch apparatus |
| US2912512A (en) * | 1956-06-19 | 1959-11-10 | Gen Telephone Lab Inc | Anti-sidetone and line balancing telephone circuit |
-
1931
- 1931-02-07 GB GB3949/31A patent/GB372400A/en not_active Expired
-
1932
- 1932-01-28 US US589472A patent/US1919314A/en not_active Expired - Lifetime
- 1932-01-28 NL NL60006A patent/NL35830C/xx active
- 1932-02-06 BE BE386269D patent/BE386269A/xx unknown
- 1932-02-06 FR FR732067D patent/FR732067A/en not_active Expired
-
1933
- 1933-01-27 GB GB2661/33A patent/GB407808A/en not_active Expired
-
1934
- 1934-01-31 GB GB3238/34A patent/GB425566A/en not_active Expired
-
1935
- 1935-01-11 US US1318A patent/US2099381A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| GB372400A (en) | 1932-05-09 |
| US1919314A (en) | 1933-07-25 |
| NL35830C (en) | 1935-07-15 |
| FR732067A (en) | 1932-09-13 |
| GB425566A (en) | 1935-03-18 |
| GB407808A (en) | 1934-03-29 |
| US2099381A (en) | 1937-11-16 |