GB348716A - Improvements in or relating to telephone transmitters - Google Patents
Improvements in or relating to telephone transmittersInfo
- Publication number
- GB348716A GB348716A GB5809/30A GB580930A GB348716A GB 348716 A GB348716 A GB 348716A GB 5809/30 A GB5809/30 A GB 5809/30A GB 580930 A GB580930 A GB 580930A GB 348716 A GB348716 A GB 348716A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diaphragm
- chamber
- washer
- electrode
- casing
- 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)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL32162D NL32162C (de) | 1930-02-21 | ||
BE374582D BE374582A (de) | 1930-02-21 | ||
GB5809/30A GB348716A (en) | 1930-02-21 | 1930-02-21 | Improvements in or relating to telephone transmitters |
FR705756D FR705756A (fr) | 1930-02-21 | 1930-11-04 | Perfectionnements aux transmetteurs téléphoniques |
US506890A US1952889A (en) | 1930-02-21 | 1931-01-06 | Telephone transmitter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5809/30A GB348716A (en) | 1930-02-21 | 1930-02-21 | Improvements in or relating to telephone transmitters |
Publications (1)
Publication Number | Publication Date |
---|---|
GB348716A true GB348716A (en) | 1931-05-21 |
Family
ID=9803011
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5809/30A Expired GB348716A (en) | 1930-02-21 | 1930-02-21 | Improvements in or relating to telephone transmitters |
Country Status (5)
Country | Link |
---|---|
US (1) | US1952889A (de) |
BE (1) | BE374582A (de) |
FR (1) | FR705756A (de) |
GB (1) | GB348716A (de) |
NL (1) | NL32162C (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5181253A (en) * | 1991-01-08 | 1993-01-19 | Southern Audio Services, Inc. | Loudspeaker assembly |
US7480209B2 (en) * | 2007-05-29 | 2009-01-20 | Harris Corporation | Submersible loudspeaker assembly |
-
0
- BE BE374582D patent/BE374582A/xx unknown
- NL NL32162D patent/NL32162C/xx active
-
1930
- 1930-02-21 GB GB5809/30A patent/GB348716A/en not_active Expired
- 1930-11-04 FR FR705756D patent/FR705756A/fr not_active Expired
-
1931
- 1931-01-06 US US506890A patent/US1952889A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US1952889A (en) | 1934-03-27 |
NL32162C (de) | |
FR705756A (fr) | 1931-06-12 |
BE374582A (de) |
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