FR705756A - Improvements to telephone transmitters - Google Patents

Improvements to telephone transmitters

Info

Publication number
FR705756A
FR705756A FR705756DA FR705756A FR 705756 A FR705756 A FR 705756A FR 705756D A FR705756D A FR 705756DA FR 705756 A FR705756 A FR 705756A
Authority
FR
France
Prior art keywords
telephone transmitters
transmitters
telephone
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
Other languages
French (fr)
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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
Application filed by Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR705756A publication Critical patent/FR705756A/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)
FR705756D 1930-02-21 1930-11-04 Improvements to telephone transmitters Expired FR705756A (en)

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
FR705756A true FR705756A (en) 1931-06-12

Family

ID=9803011

Family Applications (1)

Application Number Title Priority Date Filing Date
FR705756D Expired FR705756A (en) 1930-02-21 1930-11-04 Improvements to telephone transmitters

Country Status (5)

Country Link
US (1) US1952889A (en)
BE (1) BE374582A (en)
FR (1) FR705756A (en)
GB (1) GB348716A (en)
NL (1) NL32162C (en)

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
BE374582A (en)
US1952889A (en) 1934-03-27
GB348716A (en) 1931-05-21
NL32162C (en)

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