BE422587A - - Google Patents
Info
- Publication number
- BE422587A BE422587A BE422587DA BE422587A BE 422587 A BE422587 A BE 422587A BE 422587D A BE422587D A BE 422587DA BE 422587 A BE422587 A BE 422587A
- 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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/225—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for telephonic receivers
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US215787XA | 1936-08-01 | 1936-08-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE422587A true BE422587A (da) |
Family
ID=21805020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE422587D BE422587A (da) | 1936-08-01 |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE422587A (da) |
| CH (1) | CH215787A (da) |
| FR (1) | FR824971A (da) |
| GB (1) | GB481351A (da) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE854670C (de) * | 1948-10-02 | 1952-11-06 | Electroacustic Ges M B H | Daempfungseinrichtung von Telephonen und Mikrophonen |
| DE947083C (de) * | 1952-10-01 | 1956-08-09 | Standard Elek K Ag | Elektromagnetisches Schallgeraet in Kapselform |
| NL8501650A (nl) * | 1985-06-07 | 1987-01-02 | Philips Nv | Elektrodynamische omzetter met een tweedelig membraan. |
| NL8602451A (nl) * | 1986-09-29 | 1988-04-18 | Philips Nv | Luidspreker met een tweedelig membraan voor toepassing als autoluidspreker. |
-
0
- BE BE422587D patent/BE422587A/xx unknown
-
1937
- 1937-06-11 GB GB16280/37A patent/GB481351A/en not_active Expired
- 1937-07-29 CH CH215787D patent/CH215787A/de unknown
- 1937-07-30 FR FR824971D patent/FR824971A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR824971A (fr) | 1938-02-21 |
| CH215787A (de) | 1941-07-15 |
| GB481351A (en) | 1938-03-09 |