NL28417C - - Google Patents
Info
- Publication number
- NL28417C NL28417C NL28417DA NL28417C NL 28417 C NL28417 C NL 28417C NL 28417D A NL28417D A NL 28417DA NL 28417 C NL28417 C NL 28417C
- 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
- H04R11/00—Transducers of moving-armature or moving-core type
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Thin Magnetic Films (AREA)
- Soft Magnetic Materials (AREA)
- Magnetic Treatment Devices (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL343908X | 1928-11-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL28417C true NL28417C (ko) |
Family
ID=19784806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL28417D NL28417C (ko) | 1928-11-13 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US1817787A (ko) |
| DE (1) | DE568307C (ko) |
| FR (1) | FR684767A (ko) |
| GB (1) | GB343908A (ko) |
| NL (1) | NL28417C (ko) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB690490A (en) * | 1949-01-14 | 1953-04-22 | Fonofilm Ind As | Improvements in phonograph pick-up devices |
| DE1061439B (de) * | 1953-12-31 | 1959-07-16 | Standard Elektrik Lorenz Ag | Vierpoliges, polarisiertes Magnetsystem, insbesondere fuer lautstarke Wecker mit hoher Ansprechempfindlichkeit |
-
0
- NL NL28417D patent/NL28417C/xx active
-
1929
- 1929-11-01 US US404169A patent/US1817787A/en not_active Expired - Lifetime
- 1929-11-11 GB GB34431/29A patent/GB343908A/en not_active Expired
- 1929-11-12 FR FR684767D patent/FR684767A/fr not_active Expired
- 1929-11-13 DE DEN31156D patent/DE568307C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE568307C (de) | 1933-01-19 |
| US1817787A (en) | 1931-08-04 |
| FR684767A (fr) | 1930-07-01 |
| GB343908A (en) | 1931-02-11 |