NL73059C - - Google Patents
Info
- Publication number
- NL73059C NL73059C NL73059DA NL73059C NL 73059 C NL73059 C NL 73059C NL 73059D A NL73059D A NL 73059DA NL 73059 C NL73059 C NL 73059C
- 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
- H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
- H04R13/02—Telephone receivers
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US274485A US2249158A (en) | 1939-05-19 | 1939-05-19 | Electroacoustic transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL73059C true NL73059C (https=) |
Family
ID=23048388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL73059D NL73059C (https=) | 1939-05-19 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2249158A (https=) |
| BE (1) | BE439377A (https=) |
| CH (1) | CH233992A (https=) |
| FR (1) | FR865593A (https=) |
| NL (1) | NL73059C (https=) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2449557A (en) * | 1944-02-04 | 1948-09-21 | Sonotone Corp | Electromagnetic earphone receiver |
| US2492255A (en) * | 1944-12-26 | 1949-12-27 | John O Angehrn | Sealed-coil type vibratory magnet loudspeaker |
| US2493734A (en) * | 1945-05-23 | 1950-01-03 | Sonotone Corp | Magnetic insert earphone insertable in the ear of the user |
| BE476263A (https=) * | 1946-06-21 | |||
| US2515414A (en) * | 1947-09-08 | 1950-07-18 | Indiana Steel Products Co | Telephone receiver |
| US2522266A (en) * | 1948-05-25 | 1950-09-12 | Beltone Hearing Aid Co | Magnetic receiver |
| US2830240A (en) * | 1954-09-23 | 1958-04-08 | Hoffman Electronics Corp | Electromagnetically controlled capacitors or the like |
| BE548920A (https=) * | 1955-08-19 | |||
| JPS57153400U (https=) * | 1981-03-20 | 1982-09-27 | ||
| US4852444A (en) * | 1986-12-04 | 1989-08-01 | Hoover Alan A | Electro-mechanical transducer which couples positive acoustic feedback into an electric amplified guitar body for the purpose of sustaining played notes |
-
0
- BE BE439377D patent/BE439377A/fr unknown
- NL NL73059D patent/NL73059C/xx active
-
1939
- 1939-05-19 US US274485A patent/US2249158A/en not_active Expired - Lifetime
-
1940
- 1940-05-11 FR FR865593D patent/FR865593A/fr not_active Expired
- 1940-10-11 CH CH233992D patent/CH233992A/fr unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE439377A (https=) | |
| FR865593A (fr) | 1941-05-27 |
| CH233992A (fr) | 1944-08-31 |
| US2249158A (en) | 1941-07-15 |