BE457498A - - Google Patents
Info
- Publication number
- BE457498A BE457498A BE457498DA BE457498A BE 457498 A BE457498 A BE 457498A BE 457498D A BE457498D A BE 457498DA BE 457498 A BE457498 A BE 457498A
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R11/00—Transducers of moving-armature or moving-core type
- H04R11/02—Loudspeakers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL906904X | 1943-09-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE457498A true BE457498A (https=) |
Family
ID=19858636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE457498D BE457498A (https=) | 1943-09-08 |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE457498A (https=) |
| FR (1) | FR906904A (https=) |
-
0
- BE BE457498D patent/BE457498A/xx unknown
-
1944
- 1944-09-06 FR FR906904D patent/FR906904A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR906904A (fr) | 1946-02-25 |