NL19874C - - Google Patents
Info
- Publication number
- NL19874C NL19874C NL19874DA NL19874C NL 19874 C NL19874 C NL 19874C NL 19874D A NL19874D A NL 19874DA NL 19874 C NL19874 C NL 19874C
- 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)
- Diaphragms For Electromechanical Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US77033A US1763048A (en) | 1925-12-22 | 1925-12-22 | Loud-speaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL19874C true NL19874C (https=) |
Family
ID=22135690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL19874D NL19874C (https=) | 1925-12-22 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US1763048A (https=) |
| FR (1) | FR616504A (https=) |
| GB (1) | GB263481A (https=) |
| NL (1) | NL19874C (https=) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10484768B2 (en) | 2017-05-23 | 2019-11-19 | Eric James Lundgard | Speaker system |
-
0
- NL NL19874D patent/NL19874C/xx active
-
1925
- 1925-12-22 US US77033A patent/US1763048A/en not_active Expired - Lifetime
-
1926
- 1926-04-13 GB GB9736/26A patent/GB263481A/en not_active Expired
- 1926-05-22 FR FR616504D patent/FR616504A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US1763048A (en) | 1930-06-10 |
| GB263481A (en) | 1927-09-13 |
| FR616504A (fr) | 1927-02-03 |