BE396307A - - Google Patents
Info
- Publication number
- BE396307A BE396307A BE396307DA BE396307A BE 396307 A BE396307 A BE 396307A BE 396307D A BE396307D A BE 396307DA BE 396307 A BE396307 A BE 396307A
- 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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/12—Sanitary or hygienic devices for mouthpieces or earpieces, e.g. for protecting against infection
Landscapes
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR42126T | 1931-11-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE396307A true BE396307A (zh) |
Family
ID=8678216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE396307D BE396307A (zh) | 1931-11-07 |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE396307A (zh) |
| FR (2) | FR737931A (zh) |
-
0
- BE BE396307D patent/BE396307A/xx unknown
-
1931
- 1931-09-24 FR FR737931D patent/FR737931A/fr not_active Expired
- 1931-11-07 FR FR42126D patent/FR42126E/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR737931A (fr) | 1932-12-19 |
| FR42126E (fr) | 1933-05-31 |