BE481448A - - Google Patents
Info
- Publication number
- BE481448A BE481448A BE481448DA BE481448A BE 481448 A BE481448 A BE 481448A BE 481448D A BE481448D A BE 481448DA BE 481448 A BE481448 A BE 481448A
- 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
- H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
- H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Noise Elimination (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB371247A GB651457A (en) | 1947-02-07 | 1947-02-07 | Improvements in or relating to electric signalling systems |
| GB1160547A GB651461A (en) | 1947-02-07 | 1947-04-30 | Improvements in or relating to alternating current signalling systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE481448A true BE481448A (en:Method) |
Family
ID=32232341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE481448D BE481448A (en:Method) | 1947-02-07 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2577755A (en:Method) |
| BE (1) | BE481448A (en:Method) |
| CH (2) | CH272712A (en:Method) |
| FR (2) | FR65204E (en:Method) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2712232A (en) * | 1951-05-10 | 1955-07-05 | Stewart Warner Corp | Balancing apparatus |
| US2728852A (en) * | 1951-07-26 | 1955-12-27 | Moran Instr Corp | Echo ranging apparatus |
| BE514053A (en:Method) * | 1951-09-10 | |||
| US2985717A (en) * | 1952-05-09 | 1961-05-23 | Bell Telephone Labor Inc | Carrier telegraph switchboard supervisory systems |
| US2901541A (en) * | 1956-05-25 | 1959-08-25 | Automatic Telephone & Elect | Telegraph receivers |
| US3124658A (en) * | 1958-02-28 | 1964-03-10 | Input | |
| US3133992A (en) * | 1958-10-13 | 1964-05-19 | Matthew C Dickman | Automatic answering, recording and reproducing machine |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE698170C (de) * | 1938-03-29 | 1940-11-04 | Siemens & Halske Akt Ges | Tasteinrichtung fuer Wechselstromtelegrafie |
| CH214050A (de) * | 1938-10-21 | 1941-03-31 | Fides Gmbh | Tasteinrichtung in einer Wechselstromtelegraphieanlage. |
| US2402058A (en) * | 1941-06-25 | 1946-06-11 | Hazeltine Research Inc | Secrecy communication system |
| NL70720C (en:Method) * | 1941-09-15 | |||
| US2310749A (en) * | 1942-03-31 | 1943-02-09 | Bell Telephone Labor Inc | Singaling system |
| US2401404A (en) * | 1942-08-29 | 1946-06-04 | Rca Corp | Electrical multiplying circuit |
| US2403540A (en) * | 1943-04-23 | 1946-07-09 | Rca Corp | Reciprocal circuit |
| BE462165A (en:Method) * | 1944-12-04 |
-
0
- FR FR960660D patent/FR960660A/fr not_active Expired
- BE BE481448D patent/BE481448A/xx unknown
-
1948
- 1948-02-07 CH CH272712D patent/CH272712A/de unknown
- 1948-04-27 CH CH274626D patent/CH274626A/de unknown
- 1948-04-27 US US23438A patent/US2577755A/en not_active Expired - Lifetime
- 1948-04-30 FR FR65204D patent/FR65204E/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR960660A (en:Method) | 1950-04-22 |
| US2577755A (en) | 1951-12-11 |
| CH274626A (de) | 1951-04-15 |
| FR65204E (fr) | 1956-02-07 |
| CH272712A (de) | 1950-12-31 |