FR434390A - - Google Patents
Info
- Publication number
- FR434390A FR434390A FR434390DA FR434390A FR 434390 A FR434390 A FR 434390A FR 434390D A FR434390D A FR 434390DA FR 434390 A FR434390 A FR 434390A
- 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
- H04R21/023—Microphones with more than one granular chamber
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB191116956T | 1911-07-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR434390A true FR434390A (fr) |
Family
ID=34357433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR434390D Active FR434390A (fr) | 1911-07-24 |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR434390A (fr) |
| GB (1) | GB191116956A (fr) |
-
0
- FR FR434390D patent/FR434390A/fr active Active
-
1911
- 1911-07-24 GB GB191116956D patent/GB191116956A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB191116956A (en) | 1912-05-09 |