NL28231C - - Google Patents
Info
- Publication number
- NL28231C NL28231C NL28231DA NL28231C NL 28231 C NL28231 C NL 28231C NL 28231D A NL28231D A NL 28231DA NL 28231 C NL28231 C NL 28231C
- 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
- H04R19/00—Electrostatic transducers
- H04R19/02—Loudspeakers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
- Circuit For Audible Band Transducer (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE289472X | 1927-04-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL28231C true NL28231C (en:Method) |
Family
ID=6059837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL28231D NL28231C (en:Method) | 1927-04-28 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US1737872A (en:Method) |
| FR (1) | FR653356A (en:Method) |
| GB (1) | GB289472A (en:Method) |
| NL (1) | NL28231C (en:Method) |
-
0
- NL NL28231D patent/NL28231C/xx active
-
1928
- 1928-04-24 FR FR653356D patent/FR653356A/fr not_active Expired
- 1928-04-26 GB GB12182/28A patent/GB289472A/en not_active Expired
- 1928-04-28 US US273633A patent/US1737872A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US1737872A (en) | 1929-12-03 |
| FR653356A (fr) | 1929-03-20 |
| GB289472A (en) | 1929-06-06 |