FR740836A - Perfectionnements apportés aux appareils téléphoniques, notamment à ceux devant comporter des capsules laryngophoniques - Google Patents
Perfectionnements apportés aux appareils téléphoniques, notamment à ceux devant comporter des capsules laryngophoniquesInfo
- Publication number
- FR740836A FR740836A FR740836DA FR740836A FR 740836 A FR740836 A FR 740836A FR 740836D A FR740836D A FR 740836DA FR 740836 A FR740836 A FR 740836A
- Authority
- FR
- France
- Prior art keywords
- laryngophonic
- capsules
- those
- improvements made
- telephone devices
- 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
-
- 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
- H04R1/14—Throat mountings for microphones
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE740836X | 1931-07-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR740836A true FR740836A (fr) | 1933-02-01 |
Family
ID=3879441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR740836D Expired FR740836A (fr) | 1931-07-30 | 1932-07-29 | Perfectionnements apportés aux appareils téléphoniques, notamment à ceux devant comporter des capsules laryngophoniques |
Country Status (2)
Country | Link |
---|---|
BE (3) | BE384854A (zh) |
FR (1) | FR740836A (zh) |
-
0
- BE BE386567D patent/BE386567A/xx unknown
- BE BE381693D patent/BE381693A/xx unknown
- BE BE384854D patent/BE384854A/xx unknown
-
1932
- 1932-07-29 FR FR740836D patent/FR740836A/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE381693A (zh) | |
BE384854A (zh) | |
BE386567A (zh) |
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