FR743226A - - Google Patents
Info
- Publication number
- FR743226A FR743226A FR743226DA FR743226A FR 743226 A FR743226 A FR 743226A FR 743226D A FR743226D A FR 743226DA FR 743226 A FR743226 A FR 743226A
- Authority
- FR
- France
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR743226A true FR743226A (fr) | 1933-03-25 |
Family
ID=1547517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR743226D Expired FR743226A (fr) |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR743226A (fr) |
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0
- FR FR743226D patent/FR743226A/fr not_active Expired