NL21057C - - Google Patents
Info
- Publication number
- NL21057C NL21057C NL21057DA NL21057C NL 21057 C NL21057 C NL 21057C NL 21057D A NL21057D A NL 21057DA NL 21057 C NL21057 C NL 21057C
- Authority
- NL
- Netherlands
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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US34255A US1630008A (en) | 1925-06-01 | 1925-06-01 | Cone-type loud speaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL21057C true NL21057C (https=) |
Family
ID=21875256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL21057D NL21057C (https=) | 1925-06-01 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US1630008A (https=) |
| BE (1) | BE334366A (https=) |
| DE (1) | DE551526C (https=) |
| FR (1) | FR616148A (https=) |
| GB (2) | GB252685A (https=) |
| NL (1) | NL21057C (https=) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2810447A (en) * | 1955-05-31 | 1957-10-22 | Ford Motor Co | Rear seat speaker |
| US5418337A (en) * | 1993-05-28 | 1995-05-23 | Bose Corporation | Loudspeaker driver surrounding |
-
0
- BE BE334366D patent/BE334366A/xx unknown
- NL NL21057D patent/NL21057C/xx active
-
1925
- 1925-06-01 US US34255A patent/US1630008A/en not_active Expired - Lifetime
-
1926
- 1926-04-13 GB GB9728/26A patent/GB252685A/en not_active Expired
- 1926-04-13 GB GB28790/26A patent/GB261426A/en not_active Expired
- 1926-05-14 FR FR616148D patent/FR616148A/fr not_active Expired
- 1926-05-29 DE DEH106714D patent/DE551526C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR616148A (fr) | 1927-01-24 |
| GB252685A (en) | 1927-06-02 |
| GB261426A (en) | 1927-04-21 |
| BE334366A (https=) | |
| US1630008A (en) | 1927-05-24 |
| DE551526C (de) | 1932-06-02 |