NL4873C - - Google Patents
Info
- Publication number
- NL4873C NL4873C NL4873DA NL4873C NL 4873 C NL4873 C NL 4873C NL 4873D A NL4873D A NL 4873DA NL 4873 C NL4873 C NL 4873C
- Authority
- NL
- Netherlands
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
- H04R21/023—Microphones with more than one granular chamber
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US221192A US1335592A (en) | 1918-03-08 | 1918-03-08 | Transmitting device for micro oscillations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL4873C true NL4873C (ref) |
Family
ID=22826757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL4873D NL4873C (ref) | 1918-03-08 |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US1335592A (ref) |
| NL (1) | NL4873C (ref) |
-
0
- NL NL4873D patent/NL4873C/xx active
-
1918
- 1918-03-08 US US221192A patent/US1335592A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US1335592A (en) | 1920-03-30 |