BE402491A - - Google Patents
Info
- Publication number
- BE402491A BE402491A BE402491DA BE402491A BE 402491 A BE402491 A BE 402491A BE 402491D A BE402491D A BE 402491DA BE 402491 A BE402491 A BE 402491A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/021—Microphones with granular resistance material
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Telephone Set Structure (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US670406A US2042822A (en) | 1933-05-11 | 1933-05-11 | Telephone transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE402491A true BE402491A (en:Method) |
Family
ID=24690278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE402491D BE402491A (en:Method) | 1933-05-11 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2042822A (en:Method) |
| BE (1) | BE402491A (en:Method) |
| DE (1) | DE642693C (en:Method) |
| FR (1) | FR771454A (en:Method) |
| GB (1) | GB435130A (en:Method) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE757629C (de) * | 1938-09-09 | 1953-01-19 | Lorenz C Ag | Querstrommikrofon |
| DE740642C (de) * | 1941-01-25 | 1943-10-25 | Kabelindustrie Ag | Kapselmikrofon mit einem aus Isolierstoff bestehenden Kapselgehaeuse |
| US2431022A (en) * | 1942-12-21 | 1947-11-18 | Kellogg Switchboard & Supply | Telephone transmitter |
| BE468390A (en:Method) * | 1943-12-28 | |||
| BE482597A (en:Method) * | 1944-08-15 | |||
| US2494704A (en) * | 1945-09-01 | 1950-01-17 | Bell Telephone Labor Inc | Microphone with fuse |
| US2538026A (en) * | 1946-05-07 | 1951-01-16 | Univ Loudspeakers Inc | Electroacoustic transducer for actuating loud speakers |
| US2527159A (en) * | 1947-04-26 | 1950-10-24 | Bell Telephone Labor Inc | Telephone transmitter with radial slots in the carbon chamber |
| US2532741A (en) * | 1947-10-31 | 1950-12-05 | Bell Telephone Labor Inc | Microphone with opposite electrodes being of varying and constant curvature |
| NL70196C (en:Method) * | 1947-10-31 | |||
| US2609458A (en) * | 1948-01-16 | 1952-09-02 | Vigren Sten Daniel | Telephone apparatus |
| US2585052A (en) * | 1948-04-23 | 1952-02-12 | Int Standard Electric Corp | Granule type acoustic transducer |
| US2819351A (en) * | 1955-07-21 | 1958-01-07 | Robin Hood Co | Microphone |
-
0
- BE BE402491D patent/BE402491A/xx unknown
-
1933
- 1933-05-11 US US670406A patent/US2042822A/en not_active Expired - Lifetime
-
1934
- 1934-03-16 GB GB8348/34A patent/GB435130A/en not_active Expired
- 1934-04-09 FR FR771454D patent/FR771454A/fr not_active Expired
- 1934-05-12 DE DEI49678D patent/DE642693C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR771454A (fr) | 1934-10-09 |
| DE642693C (de) | 1937-03-12 |
| GB435130A (en) | 1935-09-16 |
| US2042822A (en) | 1936-06-02 |