BE335004A - - Google Patents
Info
- Publication number
- BE335004A BE335004A BE335004DA BE335004A BE 335004 A BE335004 A BE 335004A BE 335004D A BE335004D A BE 335004DA BE 335004 A BE335004 A BE 335004A
- 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
- H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2332925A GB261875A (en) | 1925-09-18 | 1925-09-18 | Improvements in and relating to loud-speaking telephones |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE335004A true BE335004A (en:Method) |
Family
ID=10193841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE335004D BE335004A (en:Method) | 1925-09-18 |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE335004A (en:Method) |
| FR (1) | FR618035A (en:Method) |
| GB (1) | GB261875A (en:Method) |
-
0
- BE BE335004D patent/BE335004A/xx unknown
-
1925
- 1925-09-18 GB GB2332925A patent/GB261875A/en not_active Expired
-
1926
- 1926-06-22 FR FR618035D patent/FR618035A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR618035A (fr) | 1927-03-02 |
| GB261875A (en) | 1926-12-02 |