BE447677A - - Google Patents
Info
- Publication number
- BE447677A BE447677A BE447677DA BE447677A BE 447677 A BE447677 A BE 447677A BE 447677D A BE447677D A BE 447677DA BE 447677 A BE447677 A BE 447677A
- 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
- H04R21/00—Variable-resistance transducers
- H04R21/04—Gramophone pick-ups using a stylus; Recorders using a stylus
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Lubricants (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR879597T | 1941-10-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE447677A true BE447677A (en:Method) |
Family
ID=9361883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE447677D BE447677A (en:Method) | 1941-10-24 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2382692A (en:Method) |
| BE (1) | BE447677A (en:Method) |
| FR (1) | FR879597A (en:Method) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2432066A (en) * | 1945-04-26 | 1947-12-02 | Well Surveys Inc | Commutator design |
| US2542457A (en) * | 1946-12-31 | 1951-02-20 | Soundscriber Corp | Electrodynamic pickup |
| US2566761A (en) * | 1948-12-07 | 1951-09-04 | Dubilier William | Hearing aid |
-
0
- BE BE447677D patent/BE447677A/xx unknown
-
1941
- 1941-10-24 FR FR879597D patent/FR879597A/fr not_active Expired
-
1942
- 1942-08-14 US US454871A patent/US2382692A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2382692A (en) | 1945-08-14 |
| FR879597A (fr) | 1943-02-26 |