FR220488A - - Google Patents
Info
- Publication number
- FR220488A FR220488A FR220488DA FR220488A FR 220488 A FR220488 A FR 220488A FR 220488D A FR220488D A FR 220488DA FR 220488 A FR220488 A FR 220488A
- 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
- H04R21/028—Microphones with a fluid as resistance material
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Toys (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT190913922X | 1909-01-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR220488A true FR220488A (xx) |
Family
ID=32512950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR220488D Active FR220488A (xx) | 1909-01-16 |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR220488A (xx) |
| GB (1) | GB190913922A (xx) |
-
0
- FR FR220488D patent/FR220488A/fr active Active
-
1909
- 1909-06-14 GB GB190913922D patent/GB190913922A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| GB190913922A (en) |