BE424192A - - Google Patents
Info
- Publication number
- BE424192A BE424192A BE424192DA BE424192A BE 424192 A BE424192 A BE 424192A BE 424192D A BE424192D A BE 424192DA BE 424192 A BE424192 A BE 424192A
- 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 |
|---|---|---|---|
| GB828391X | 1937-04-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE424192A true BE424192A (en:Method) |
Family
ID=10535699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE424192D BE424192A (en:Method) | 1937-04-06 |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE424192A (en:Method) |
| FR (1) | FR828391A (en:Method) |
-
0
- BE BE424192D patent/BE424192A/xx unknown
-
1937
- 1937-10-28 FR FR828391D patent/FR828391A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR828391A (fr) | 1938-05-17 |