FR742764A - - Google Patents
Info
- Publication number
- FR742764A FR742764A FR742764DA FR742764A FR 742764 A FR742764 A FR 742764A FR 742764D A FR742764D A FR 742764DA FR 742764 A FR742764 A FR 742764A
- 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
- H04R29/00—Monitoring arrangements; Testing arrangements
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR742764A true FR742764A (fr) | 1933-03-15 |
Family
ID=1547120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR742764D Expired FR742764A (fr) |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR742764A (fr) |
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0
- FR FR742764D patent/FR742764A/fr not_active Expired