BE358487A - - Google Patents
Info
- Publication number
- BE358487A BE358487A BE358487DA BE358487A BE 358487 A BE358487 A BE 358487A BE 358487D A BE358487D A BE 358487DA BE 358487 A BE358487 A BE 358487A
- 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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
- H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB727528A GB308449A (en) | 1928-03-08 | 1928-03-08 | Improvements relating to telephone instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE358487A true BE358487A (en:Method) |
Family
ID=9829965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE358487D BE358487A (en:Method) | 1928-03-08 |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE358487A (en:Method) |
| FR (1) | FR670618A (en:Method) |
| GB (1) | GB308449A (en:Method) |
-
0
- BE BE358487D patent/BE358487A/xx unknown
-
1928
- 1928-03-08 GB GB727528A patent/GB308449A/en not_active Expired
-
1929
- 1929-02-28 FR FR670618D patent/FR670618A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB308449A (en) | 1929-03-28 |
| FR670618A (fr) | 1929-12-02 |