NL25231C - - Google Patents
Info
- Publication number
- NL25231C NL25231C NL25231DA NL25231C NL 25231 C NL25231 C NL 25231C NL 25231D A NL25231D A NL 25231DA NL 25231 C NL25231 C NL 25231C
- 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
- H04R21/026—Microphones in which the sound is perpendicular to the current crossing the transducer material
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 |
|---|---|---|---|
| NL310513X | 1928-04-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL25231C true NL25231C (https=) |
Family
ID=19783616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL25231D NL25231C (https=) | 1928-04-27 |
Country Status (3)
| Country | Link |
|---|---|
| FR (1) | FR672159A (https=) |
| GB (1) | GB310513A (https=) |
| NL (1) | NL25231C (https=) |
-
0
- NL NL25231D patent/NL25231C/xx active
-
1929
- 1929-03-25 GB GB9546/29A patent/GB310513A/en not_active Expired
- 1929-03-27 FR FR672159D patent/FR672159A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB310513A (en) | 1930-02-27 |
| FR672159A (fr) | 1929-12-24 |