BE540009A - - Google Patents
Info
- Publication number
- BE540009A BE540009A BE540009DA BE540009A BE 540009 A BE540009 A BE 540009A BE 540009D A BE540009D A BE 540009DA BE 540009 A BE540009 A BE 540009A
- Authority
- BE
- Belgium
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
- H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Telephone Set Structure (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL331379X | 1954-07-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE540009A true BE540009A (en:Method) |
Family
ID=19784383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE540009D BE540009A (en:Method) | 1954-07-23 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2852627A (en:Method) |
| BE (1) | BE540009A (en:Method) |
| CH (1) | CH331379A (en:Method) |
| GB (1) | GB791295A (en:Method) |
| NL (1) | NL85836C (en:Method) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3179749A (en) * | 1960-03-03 | 1965-04-20 | Milton L Snow | Telephone instrument controlling device |
| NL274625A (en:Method) * | 1961-02-10 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1644788A (en) * | 1922-12-08 | 1927-10-11 | Western Electric Co | Acoustic device |
| US2249161A (en) * | 1939-05-19 | 1941-07-15 | Bell Telephone Labor Inc | Electroacoustic device |
-
0
- NL NL85836D patent/NL85836C/xx active
- BE BE540009D patent/BE540009A/xx unknown
-
1955
- 1955-07-08 US US520886A patent/US2852627A/en not_active Expired - Lifetime
- 1955-07-20 GB GB21008/55A patent/GB791295A/en not_active Expired
- 1955-07-21 CH CH331379D patent/CH331379A/de unknown
Also Published As
| Publication number | Publication date |
|---|---|
| US2852627A (en) | 1958-09-16 |
| CH331379A (de) | 1958-07-15 |
| GB791295A (en) | 1958-02-26 |
| NL85836C (en:Method) |