NL4427C - - Google Patents
Info
- Publication number
- NL4427C NL4427C NL4427DA NL4427C NL 4427 C NL4427 C NL 4427C NL 4427D A NL4427D A NL 4427DA NL 4427 C NL4427 C NL 4427C
- 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
- H04R21/021—Microphones with granular resistance material
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Exhaust Silencers (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US106093A US1342582A (en) | 1916-06-27 | 1916-06-27 | Telephone-transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL4427C true NL4427C (de) |
Family
ID=22309447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL4427D NL4427C (de) | 1916-06-27 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US1342582A (de) |
| DE (1) | DE353757C (de) |
| FR (1) | FR495429A (de) |
| NL (1) | NL4427C (de) |
-
0
- NL NL4427D patent/NL4427C/xx active
-
1916
- 1916-06-27 US US106093A patent/US1342582A/en not_active Expired - Lifetime
-
1917
- 1917-08-18 FR FR495429A patent/FR495429A/fr not_active Expired
-
1919
- 1919-11-15 DE DE1919353757D patent/DE353757C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR495429A (fr) | 1919-10-08 |
| DE353757C (de) | 1922-05-26 |
| US1342582A (en) | 1920-06-08 |