BE469898A - - Google Patents
Info
- Publication number
- BE469898A BE469898A BE469898DA BE469898A BE 469898 A BE469898 A BE 469898A BE 469898D A BE469898D A BE 469898DA BE 469898 A BE469898 A BE 469898A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3129/44A GB571908A (en) | 1944-02-19 | 1944-02-19 | Improvements in or relating to telephone or like systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE469898A true BE469898A (en:Method) |
Family
ID=9752463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE469898D BE469898A (en:Method) | 1944-02-19 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2475546A (en:Method) |
| BE (1) | BE469898A (en:Method) |
| GB (1) | GB571908A (en:Method) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR954202A (fr) * | 1946-10-11 | 1949-12-21 | Automatic Elect Lab | Système téléphonique à commutation automatique, notamment pour appels interurbains |
| US3003040A (en) * | 1956-01-25 | 1961-10-03 | Gen Dynamics Corp | Modified trunk circuit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1606199A (en) * | 1923-09-18 | 1926-11-09 | Western Electric Co | Telephone-exchange system |
| US1829803A (en) * | 1930-08-04 | 1931-11-03 | Bell Telephone Labor Inc | Telephone system |
| US2153654A (en) * | 1935-06-15 | 1939-04-11 | Panstwowe Zaklady Tele I Radjo | System of tone-signaling and impulsing |
| GB534866A (en) * | 1939-10-16 | 1941-03-20 | Siemens Brothers & Co Ltd | Improvements relating to telephone and like signalling systems |
| GB559016A (en) * | 1942-07-28 | 1944-02-01 | Automatic Telephone & Elect | Improvements in or relating to telephone or like systems |
-
0
- BE BE469898D patent/BE469898A/xx unknown
-
1944
- 1944-02-19 GB GB3129/44A patent/GB571908A/en not_active Expired
- 1944-12-18 US US567229A patent/US2475546A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2475546A (en) | 1949-07-05 |
| GB571908A (en) | 1945-09-13 |