NL21660C - - Google Patents
Info
- Publication number
- NL21660C NL21660C NL21660DA NL21660C NL 21660 C NL21660 C NL 21660C NL 21660D A NL21660D A NL 21660DA NL 21660 C NL21660 C NL 21660C
- Authority
- NL
- Netherlands
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
- 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)
- Diaphragms For Electromechanical Transducers (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US90297A US1678833A (en) | 1926-02-24 | 1926-02-24 | Acoustic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL21660C true NL21660C (cs) |
Family
ID=22222163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL21660D NL21660C (cs) | 1926-02-24 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US1678833A (cs) |
| FR (1) | FR626679A (cs) |
| GB (1) | GB266675A (cs) |
| NL (1) | NL21660C (cs) |
-
0
- NL NL21660D patent/NL21660C/xx active
-
1926
- 1926-02-24 US US90297A patent/US1678833A/en not_active Expired - Lifetime
- 1926-12-02 GB GB30580/26A patent/GB266675A/en not_active Expired
- 1926-12-23 FR FR626679D patent/FR626679A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB266675A (en) | 1928-03-02 |
| US1678833A (en) | 1928-07-31 |
| FR626679A (fr) | 1927-09-16 |