DE271487C - - Google Patents
Info
- Publication number
- DE271487C DE271487C DENDAT271487D DE271487DA DE271487C DE 271487 C DE271487 C DE 271487C DE NDAT271487 D DENDAT271487 D DE NDAT271487D DE 271487D A DE271487D A DE 271487DA DE 271487 C DE271487 C DE 271487C
- Authority
- DE
- Germany
- Prior art keywords
- record
- membrane
- opening
- carbon
- powder
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE271487C true DE271487C (OSRAM) |
Family
ID=528132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT271487D Active DE271487C (OSRAM) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE271487C (OSRAM) |
-
0
- DE DENDAT271487D patent/DE271487C/de active Active
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