FR660823A - Improvements to gramophones, loudspeakers and similar instruments - Google Patents
Improvements to gramophones, loudspeakers and similar instrumentsInfo
- Publication number
- FR660823A FR660823A FR660823DA FR660823A FR 660823 A FR660823 A FR 660823A FR 660823D A FR660823D A FR 660823DA FR 660823 A FR660823 A FR 660823A
- Authority
- FR
- France
- Prior art keywords
- gramophones
- loudspeakers
- similar instruments
- instruments
- similar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB660823X | 1927-09-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR660823A true FR660823A (en) | 1929-07-17 |
Family
ID=10490900
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR660823D Expired FR660823A (en) | 1927-09-23 | 1928-09-22 | Improvements to gramophones, loudspeakers and similar instruments |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR660823A (en) |
-
1928
- 1928-09-22 FR FR660823D patent/FR660823A/en not_active Expired
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