FR404387A - - Google Patents
Info
- Publication number
- FR404387A FR404387A FR404387DA FR404387A FR 404387 A FR404387 A FR 404387A FR 404387D A FR404387D A FR 404387DA FR 404387 A FR404387 A FR 404387A
- 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.)
- Active
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)
- Prepayment Telephone Systems (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB190916912T | 1909-07-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR404387A true FR404387A (de) |
Family
ID=32444584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR404387D Active FR404387A (de) | 1909-07-20 |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR404387A (de) |
| GB (1) | GB190916912A (de) |
-
0
- FR FR404387D patent/FR404387A/fr active Active
-
1909
- 1909-07-20 GB GB190916912D patent/GB190916912A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB190916912A (en) | 1909-10-07 |