FR407395A - - Google Patents
Info
- Publication number
- FR407395A FR407395A FR407395DA FR407395A FR 407395 A FR407395 A FR 407395A FR 407395D A FR407395D A FR 407395DA FR 407395 A FR407395 A FR 407395A
- 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)
- Diaphragms For Electromechanical Transducers (AREA)
- Knitting Machines (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB190823269T | 1908-10-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR407395A true FR407395A (en) |
Family
ID=32210312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR407395D Active FR407395A (en) | 1908-10-31 |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE227823C (en) |
| FR (1) | FR407395A (en) |
| GB (1) | GB190823269A (en) |
-
0
- FR FR407395D patent/FR407395A/fr active Active
- DE DENDAT227823D patent/DE227823C/de active Active
-
1908
- 1908-10-31 GB GB190823269D patent/GB190823269A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE227823C (en) | |
| GB190823269A (en) | 1909-03-18 |