DE86432C - - Google Patents
Info
- Publication number
- DE86432C DE86432C DENDAT86432D DE86432DA DE86432C DE 86432 C DE86432 C DE 86432C DE NDAT86432 D DENDAT86432 D DE NDAT86432D DE 86432D A DE86432D A DE 86432DA DE 86432 C DE86432 C DE 86432C
- Authority
- DE
- Germany
- Prior art keywords
- coal
- microphone
- grains
- detached
- coal dust
- 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 9
- 239000002817 coal dust Substances 0.000 claims description 3
- 239000012528 membrane Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE86432C true DE86432C (Sortimente) |
Family
ID=358484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT86432D Active DE86432C (Sortimente) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE86432C (Sortimente) |
-
0
- DE DENDAT86432D patent/DE86432C/de active Active
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