BE476047A - - Google Patents
Info
- Publication number
- BE476047A BE476047A BE476047DA BE476047A BE 476047 A BE476047 A BE 476047A BE 476047D A BE476047D A BE 476047DA BE 476047 A BE476047 A BE 476047A
- 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
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
- H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
- H04Q1/4535—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted with an additional signal transmitted for voice protection
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephonic Communication Services (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB268998X | 1939-08-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE476047A true BE476047A (en:Method) |
Family
ID=10250964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE476047D BE476047A (en:Method) | 1939-08-16 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2593512A (en:Method) |
| BE (1) | BE476047A (en:Method) |
| CH (1) | CH268998A (en:Method) |
| FR (1) | FR947898A (en:Method) |
| GB (1) | GB534023A (en:Method) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1575272A (en) * | 1923-10-31 | 1926-03-02 | Western Electric Co | Telephone system |
| US2188461A (en) * | 1935-06-11 | 1940-01-30 | Ass Telephone & Telegraph Co | Mechanical impulse repeater |
| GB489609A (en) * | 1937-01-25 | 1938-07-25 | Standard Telephones Cables Ltd | Improvements in or relating to electrical communication exchange systems |
-
0
- BE BE476047D patent/BE476047A/xx unknown
-
1939
- 1939-08-16 GB GB23656/39A patent/GB534023A/en not_active Expired
-
1947
- 1947-03-22 CH CH268998D patent/CH268998A/de unknown
- 1947-06-07 US US753220A patent/US2593512A/en not_active Expired - Lifetime
- 1947-06-13 FR FR947898D patent/FR947898A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH268998A (de) | 1950-06-15 |
| US2593512A (en) | 1952-04-22 |
| FR947898A (fr) | 1949-07-15 |
| GB534023A (en) | 1941-02-26 |