BE484729A - - Google Patents
Info
- Publication number
- BE484729A BE484729A BE484729DA BE484729A BE 484729 A BE484729 A BE 484729A BE 484729D A BE484729D A BE 484729DA BE 484729 A BE484729 A BE 484729A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/001—Two-way communication systems between a limited number of parties
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephone Set Structure (AREA)
- Mobile Radio Communication Systems (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB24770/47A GB638930A (en) | 1947-09-09 | 1947-09-09 | Improvements in and relating to radio and intercommunication apparatus and systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE484729A true BE484729A (en:Method) |
Family
ID=10216983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE484729D BE484729A (en:Method) | 1947-09-09 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2559898A (en:Method) |
| BE (1) | BE484729A (en:Method) |
| FR (1) | FR980643A (en:Method) |
| GB (1) | GB638930A (en:Method) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2917581A (en) * | 1957-04-26 | 1959-12-15 | Simplex Equipment Corp | Methods and apparatus for signalling and communicating |
| US3130273A (en) * | 1958-10-01 | 1964-04-21 | Wilfred J Noecker | Intercommunication system |
| US3562438A (en) * | 1967-09-07 | 1971-02-09 | Gai Tronics Inc | Intraplant radio communication system |
| US3896379A (en) * | 1974-06-10 | 1975-07-22 | Gen Electric | Intercom circuit for a radio transmitter and receiver |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1922415A (en) * | 1929-03-25 | 1933-08-15 | Bank Maurice | Electrical-including radio-apparatus |
| US2087027A (en) * | 1935-04-15 | 1937-07-13 | United Scient Lab Inc | Loudspeaker telephone system |
| US2157140A (en) * | 1936-09-26 | 1939-05-09 | Louis A Molin | Transmitting and amplifying system |
| US2186500A (en) * | 1937-08-06 | 1940-01-09 | Electrical Res Lab Inc | Radiophone communication system |
| US2159632A (en) * | 1938-09-24 | 1939-05-23 | Harold H Fries | Combination radio receiver-hearing aid unit |
| US2409481A (en) * | 1941-06-26 | 1946-10-15 | Thomas B Fordham | Combined hearing aid and radio receiving set |
-
0
- FR FR980643D patent/FR980643A/fr not_active Expired
- BE BE484729D patent/BE484729A/xx unknown
-
1947
- 1947-09-09 GB GB24770/47A patent/GB638930A/en not_active Expired
-
1948
- 1948-09-02 US US47444A patent/US2559898A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2559898A (en) | 1951-07-10 |
| FR980643A (fr) | 1951-05-16 |
| GB638930A (en) | 1950-06-21 |