BE405299A - - Google Patents
Info
- Publication number
- BE405299A BE405299A BE405299DA BE405299A BE 405299 A BE405299 A BE 405299A BE 405299D A BE405299D A BE 405299DA BE 405299 A BE405299 A BE 405299A
- Authority
- BE
- Belgium
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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for microphones
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Carbon And Carbon Compounds (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2718533A GB423257A (en) | 1933-10-03 | 1933-10-03 | Improvements in or relating to telephone transmitters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE405299A true BE405299A (ja�@�@) |
Family
ID=10255563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE405299D BE405299A (ja�@�@) | 1933-10-03 |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE405299A (ja�@�@) |
| FR (1) | FR779146A (ja�@�@) |
| GB (1) | GB423257A (ja�@�@) |
-
0
- BE BE405299D patent/BE405299A/xx unknown
-
1933
- 1933-10-03 GB GB2718533A patent/GB423257A/en not_active Expired
-
1934
- 1934-10-01 FR FR779146D patent/FR779146A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR779146A (fr) | 1935-03-29 |
| GB423257A (en) | 1935-01-29 |