BE518909A - - Google Patents
Info
- Publication number
- BE518909A BE518909A BE518909DA BE518909A BE 518909 A BE518909 A BE 518909A BE 518909D A BE518909D A BE 518909DA BE 518909 A BE518909 A BE 518909A
- 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
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL726247X | 1952-04-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE518909A true BE518909A (it) |
Family
ID=19817821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE518909D BE518909A (it) | 1952-04-03 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2778440A (it) |
| BE (1) | BE518909A (it) |
| DE (1) | DE931055C (it) |
| GB (1) | GB726247A (it) |
| NL (1) | NL83991C (it) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1488565A (en) * | 1919-07-11 | 1924-04-01 | George W Stewart | Porous damper for acoustical instruments |
| US1975637A (en) * | 1930-05-30 | 1934-10-02 | Paraffine Co Inc | Acoustical material |
| US1954966A (en) * | 1931-01-31 | 1934-04-17 | Bell Telephone Labor Inc | Sound translating device |
| US2065751A (en) * | 1935-12-31 | 1936-12-29 | Rca Corp | Acoustic resistance device |
| US2126254A (en) * | 1936-12-23 | 1938-08-09 | Ernest E Gowell | Rug and method of making the same |
| US2656585A (en) * | 1948-04-13 | 1953-10-27 | Neisler Mills Inc | Plied yarn and plied yarn fabric and method of making same |
-
0
- BE BE518909D patent/BE518909A/xx unknown
- NL NL83991D patent/NL83991C/xx active
-
1953
- 1953-03-13 US US342144A patent/US2778440A/en not_active Expired - Lifetime
- 1953-03-31 GB GB8900/53A patent/GB726247A/en not_active Expired
- 1953-04-02 DE DEN6984A patent/DE931055C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2778440A (en) | 1957-01-22 |
| DE931055C (de) | 1955-08-01 |
| GB726247A (en) | 1955-03-16 |
| NL83991C (it) |