BE379817A - - Google Patents
Info
- Publication number
- BE379817A BE379817A BE379817DA BE379817A BE 379817 A BE379817 A BE 379817A BE 379817D A BE379817D A BE 379817DA BE 379817 A BE379817 A BE 379817A
- 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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/025—Magnetic circuit
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US452154A US1905704A (en) | 1930-05-14 | 1930-05-14 | Acoustic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE379817A true BE379817A (ja�@�@) |
Family
ID=23795266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE379817D BE379817A (ja�@�@) | 1930-05-14 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US1905704A (ja�@�@) |
| BE (1) | BE379817A (ja�@�@) |
| FR (1) | FR716994A (ja�@�@) |
-
0
- BE BE379817D patent/BE379817A/xx unknown
-
1930
- 1930-05-14 US US452154A patent/US1905704A/en not_active Expired - Lifetime
-
1931
- 1931-05-13 FR FR716994D patent/FR716994A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR716994A (fr) | 1931-12-30 |
| US1905704A (en) | 1933-04-25 |