FR759927A - - Google Patents
Info
- Publication number
- FR759927A FR759927A FR759927DA FR759927A FR 759927 A FR759927 A FR 759927A FR 759927D A FR759927D A FR 759927DA FR 759927 A FR759927 A FR 759927A
- 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
- H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
- H04R23/008—Transducers other than those covered by groups H04R9/00 - H04R21/00 using optical signals for detecting or generating sound
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR759927A true FR759927A (xx) | 1934-02-14 |
Family
ID=1550985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR759927D Expired FR759927A (xx) |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR759927A (xx) |
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0
- FR FR759927D patent/FR759927A/fr not_active Expired