GB348716A - Improvements in or relating to telephone transmitters - Google Patents

Improvements in or relating to telephone transmitters

Info

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
Application number
GB5809/30A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to NL32162D priority Critical patent/NL32162C/xx
Priority to BE374582D priority patent/BE374582A/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB5809/30A priority patent/GB348716A/en
Priority to FR705756D priority patent/FR705756A/fr
Priority to US506890A priority patent/US1952889A/en
Publication of GB348716A publication Critical patent/GB348716A/en
Expired legal-status Critical Current

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)
GB5809/30A 1930-02-21 1930-02-21 Improvements in or relating to telephone transmitters Expired GB348716A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL32162D NL32162C (en:Method) 1930-02-21
BE374582D BE374582A (en:Method) 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 (en:Method)
BE (1) BE374582A (en:Method)
FR (1) FR705756A (en:Method)
GB (1) GB348716A (en:Method)
NL (1) NL32162C (en:Method)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
FR705756A (fr) 1931-06-12
NL32162C (en:Method)
BE374582A (en:Method)
US1952889A (en) 1934-03-27

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