FR408577A - - Google Patents
Info
- Publication number
- FR408577A FR408577A FR408577DA FR408577A FR 408577 A FR408577 A FR 408577A FR 408577D A FR408577D A FR 408577DA FR 408577 A FR408577 A FR 408577A
- 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
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/021—Microphones with granular resistance material
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB190925028T | 1909-10-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR408577A true FR408577A (OSRAM) |
Family
ID=32558642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR408577D Active FR408577A (OSRAM) | 1909-10-30 |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR408577A (OSRAM) |
| GB (1) | GB190925028A (OSRAM) |
-
0
- FR FR408577D patent/FR408577A/fr active Active
-
1909
- 1909-10-30 GB GB190925028D patent/GB190925028A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB190925028A (en) | 1910-01-21 |