BE438509A - - Google Patents
Info
- Publication number
- BE438509A BE438509A BE438509DA BE438509A BE 438509 A BE438509 A BE 438509A BE 438509D A BE438509D A BE 438509DA BE 438509 A BE438509 A BE 438509A
- Authority
- BE
- Belgium
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
- H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Percussion Or Vibration Massage (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1011339A GB527100A (en) | 1939-03-31 | 1939-03-31 | Improvements in or relating to electro-acoustic devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE438509A true BE438509A (enrdf_load_html_response) |
Family
ID=9961729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE438509D BE438509A (enrdf_load_html_response) | 1939-03-31 |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE438509A (enrdf_load_html_response) |
| FR (1) | FR864321A (enrdf_load_html_response) |
| GB (1) | GB527100A (enrdf_load_html_response) |
-
0
- FR FR864321D patent/FR864321A/fr not_active Expired
- BE BE438509D patent/BE438509A/xx unknown
-
1939
- 1939-03-31 GB GB1011339A patent/GB527100A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR864321A (enrdf_load_html_response) | 1941-04-29 |
| GB527100A (en) | 1940-10-02 |