NL72183C - - Google Patents
Info
- Publication number
- NL72183C NL72183C NL72183DA NL72183C NL 72183 C NL72183 C NL 72183C NL 72183D A NL72183D A NL 72183DA NL 72183 C NL72183 C NL 72183C
- Authority
- NL
- Netherlands
Links
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)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR987601T | 1949-04-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL72183C true NL72183C (en:Method) |
Family
ID=9539031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL72183D NL72183C (en:Method) | 1949-04-06 |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR987601A (en:Method) |
| NL (1) | NL72183C (en:Method) |
-
0
- NL NL72183D patent/NL72183C/xx active
-
1949
- 1949-04-06 FR FR987601D patent/FR987601A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR987601A (fr) | 1951-08-16 |