DE90166C - - Google Patents
Info
- Publication number
- DE90166C DE90166C DENDAT90166D DE90166DA DE90166C DE 90166 C DE90166 C DE 90166C DE NDAT90166 D DENDAT90166 D DE NDAT90166D DE 90166D A DE90166D A DE 90166DA DE 90166 C DE90166 C DE 90166C
- Authority
- DE
- Germany
- Prior art keywords
- felt
- grain
- membrane
- cylinder
- opening
- Prior art date
- 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
- 239000003245 coal Substances 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000002775 capsule Substances 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
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)
- Exhaust Silencers (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE90166C true DE90166C (cs) |
Family
ID=361915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT90166D Active DE90166C (cs) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE90166C (cs) |
-
0
- DE DENDAT90166D patent/DE90166C/de active Active
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