BE572796A - - Google Patents
Info
- Publication number
- BE572796A BE572796A BE572796DA BE572796A BE 572796 A BE572796 A BE 572796A BE 572796D A BE572796D A BE 572796DA BE 572796 A BE572796 A BE 572796A
- 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 |
|---|---|---|---|
| GB1219241X | 1957-11-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE572796A true BE572796A (en:Method) |
Family
ID=10883511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE572796D BE572796A (en:Method) | 1957-11-07 |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE572796A (en:Method) |
| FR (1) | FR1219241A (en:Method) |
-
0
- BE BE572796D patent/BE572796A/xx unknown
-
1958
- 1958-11-04 FR FR778232A patent/FR1219241A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1219241A (fr) | 1960-05-16 |