NL57484C - - Google Patents
Info
- Publication number
- NL57484C NL57484C NL57484DA NL57484C NL 57484 C NL57484 C NL 57484C NL 57484D A NL57484D A NL 57484DA NL 57484 C NL57484 C NL 57484C
- 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)
- Telephone Set Structure (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3596738A GB522226A (en) | 1938-12-09 | 1938-12-09 | Improvements in or relating to telephone transmitters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL57484C true NL57484C (en:Method) |
Family
ID=10383468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL57484D NL57484C (en:Method) | 1938-12-09 |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE437314A (en:Method) |
| GB (1) | GB522226A (en:Method) |
| NL (1) | NL57484C (en:Method) |
-
0
- NL NL57484D patent/NL57484C/xx active
- BE BE437314D patent/BE437314A/xx unknown
-
1938
- 1938-12-09 GB GB3596738A patent/GB522226A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB522226A (en) | 1940-06-12 |
| BE437314A (en:Method) |