BE452250A - - Google Patents
Info
- Publication number
- BE452250A BE452250A BE452250DA BE452250A BE 452250 A BE452250 A BE 452250A BE 452250D A BE452250D A BE 452250DA BE 452250 A BE452250 A BE 452250A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/738—Interface circuits for coupling substations to external telephone lines
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2562924X | 1942-08-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE452250A true BE452250A (en:Method) | 1943-10-30 |
Family
ID=19874762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE452250D BE452250A (en:Method) | 1942-08-14 | 1943-09-10 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2562924A (en:Method) |
| BE (1) | BE452250A (en:Method) |
| CH (1) | CH244726A (en:Method) |
| FR (1) | FR897250A (en:Method) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1551171A (en) * | 1922-11-15 | 1925-08-25 | Stromberg Carlson Telephone | Automatic telephone substation circuits |
| US1687695A (en) * | 1926-03-03 | 1928-10-16 | Automatic Electric Inc | Anti-side-tone substation circuits |
| US1752429A (en) * | 1928-06-09 | 1930-04-01 | Bell Telephone Labor Inc | Telephone set |
| US1914124A (en) * | 1932-01-29 | 1933-06-13 | Bell Telephone Labor Inc | Telephone system |
| US1930537A (en) * | 1932-05-04 | 1933-10-17 | Associated Electric Lab Inc | Substation telephone circuit |
| US2134690A (en) * | 1936-10-09 | 1938-11-01 | Harry R Allensworth | Electrical communication network |
| US2375791A (en) * | 1943-03-09 | 1945-05-15 | Bell Telephone Labor Inc | Telephone station circuit |
-
1943
- 1943-08-13 FR FR897250D patent/FR897250A/fr not_active Expired
- 1943-09-10 BE BE452250D patent/BE452250A/xx unknown
- 1943-09-22 CH CH244726D patent/CH244726A/de unknown
-
1947
- 1947-07-23 US US763030A patent/US2562924A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2562924A (en) | 1951-08-07 |
| FR897250A (fr) | 1945-03-15 |
| CH244726A (de) | 1946-09-30 |