FR632498A - - Google Patents
Info
- Publication number
- FR632498A FR632498A FR632498DA FR632498A FR 632498 A FR632498 A FR 632498A FR 632498D A FR632498D A FR 632498DA FR 632498 A FR632498 A FR 632498A
- 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
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/023—Microphones with more than one granular chamber
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR632498A true FR632498A (de) | 1928-01-10 |
Family
ID=1541586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR632498D Expired FR632498A (de) |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR632498A (de) |
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0
- FR FR632498D patent/FR632498A/fr not_active Expired