FR810939A - Microphone refinements - Google Patents
Microphone refinementsInfo
- Publication number
- FR810939A FR810939A FR810939DA FR810939A FR 810939 A FR810939 A FR 810939A FR 810939D A FR810939D A FR 810939DA FR 810939 A FR810939 A FR 810939A
- Authority
- FR
- France
- Prior art keywords
- refinements
- microphone
- microphone refinements
- 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
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/021—Microphones with granular resistance material
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
- Measuring Fluid Pressure (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US40738A US2149628A (en) | 1935-09-16 | 1935-09-16 | Telephone transmitter |
Publications (1)
Publication Number | Publication Date |
---|---|
FR810939A true FR810939A (en) | 1937-04-02 |
Family
ID=21912660
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR810939D Expired FR810939A (en) | 1935-09-16 | 1936-09-14 | Microphone refinements |
Country Status (3)
Country | Link |
---|---|
US (1) | US2149628A (en) |
FR (1) | FR810939A (en) |
GB (1) | GB479469A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE484178A (en) * | 1947-08-06 | |||
US2567368A (en) * | 1949-06-09 | 1951-09-11 | Bell Telephone Labor Inc | Telephone transmitter |
BE547497A (en) * | 1955-06-02 |
-
1935
- 1935-09-16 US US40738A patent/US2149628A/en not_active Expired - Lifetime
-
1936
- 1936-08-07 GB GB21822/36A patent/GB479469A/en not_active Expired
- 1936-09-14 FR FR810939D patent/FR810939A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB479469A (en) | 1938-02-07 |
US2149628A (en) | 1939-03-07 |
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