BE386838A - - Google Patents
Info
- Publication number
- BE386838A BE386838A BE386838DA BE386838A BE 386838 A BE386838 A BE 386838A BE 386838D A BE386838D A BE 386838DA BE 386838 A BE386838 A BE 386838A
- 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)
- Telephone Set Structure (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4472/32A GB382165A (en) | 1932-02-15 | 1932-02-15 | Improvements in and relating to microphones |
| DEL80593D DE602492C (de) | 1932-02-15 | 1932-02-26 | Mikrophon mit Kohlekoernerfuellung |
| FR732482T | 1932-02-29 | ||
| BE386838T | 1932-03-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE386838A true BE386838A (US07943777-20110517-C00090.png) | 1932-04-30 |
Family
ID=9777816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE386838D BE386838A (US07943777-20110517-C00090.png) | 1932-02-15 | 1932-03-01 |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE386838A (US07943777-20110517-C00090.png) |
| DE (1) | DE602492C (US07943777-20110517-C00090.png) |
| FR (1) | FR732482A (US07943777-20110517-C00090.png) |
| GB (1) | GB382165A (US07943777-20110517-C00090.png) |
-
1932
- 1932-02-15 GB GB4472/32A patent/GB382165A/en not_active Expired
- 1932-02-26 DE DEL80593D patent/DE602492C/de not_active Expired
- 1932-02-29 FR FR732482D patent/FR732482A/fr not_active Expired
- 1932-03-01 BE BE386838D patent/BE386838A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| GB382165A (en) | 1932-10-20 |
| DE602492C (de) | 1934-09-13 |
| FR732482A (fr) | 1932-09-21 |
