BE374582A - - Google Patents
Info
- Publication number
- BE374582A BE374582A BE374582DA BE374582A BE 374582 A BE374582 A BE 374582A BE 374582D A BE374582D A BE 374582DA BE 374582 A BE374582 A BE 374582A
- 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)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5809/30A GB348716A (en) | 1930-02-21 | 1930-02-21 | Improvements in or relating to telephone transmitters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE374582A true BE374582A (en:Method) |
Family
ID=9803011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE374582D BE374582A (en:Method) | 1930-02-21 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US1952889A (en:Method) |
| BE (1) | BE374582A (en:Method) |
| FR (1) | FR705756A (en:Method) |
| GB (1) | GB348716A (en:Method) |
| NL (1) | NL32162C (en:Method) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5181253A (en) * | 1991-01-08 | 1993-01-19 | Southern Audio Services, Inc. | Loudspeaker assembly |
| US7480209B2 (en) * | 2007-05-29 | 2009-01-20 | Harris Corporation | Submersible loudspeaker assembly |
-
0
- NL NL32162D patent/NL32162C/xx active
- BE BE374582D patent/BE374582A/xx unknown
-
1930
- 1930-02-21 GB GB5809/30A patent/GB348716A/en not_active Expired
- 1930-11-04 FR FR705756D patent/FR705756A/fr not_active Expired
-
1931
- 1931-01-06 US US506890A patent/US1952889A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| GB348716A (en) | 1931-05-21 |
| US1952889A (en) | 1934-03-27 |
| NL32162C (en:Method) | |
| FR705756A (fr) | 1931-06-12 |