FR725882A - Improvements to telephone transmitters - Google Patents

Improvements to telephone transmitters

Info

Publication number
FR725882A
FR725882A FR725882DA FR725882A FR 725882 A FR725882 A FR 725882A FR 725882D A FR725882D A FR 725882DA FR 725882 A FR725882 A FR 725882A
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.)
Siemens Brothers and Co Ltd
Original Assignee
Siemens Brothers and Co Ltd
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 Siemens Brothers and Co Ltd filed Critical Siemens Brothers and Co Ltd
Application granted granted Critical
Publication of FR725882A publication Critical patent/FR725882A/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)
  • Resistance Heating (AREA)
FR725882D 1930-11-08 1931-11-07 Improvements to telephone transmitters Expired FR725882A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3361230A GB366955A (en) 1930-11-08 1930-11-08 Improvements relating to telephone transmitters

Publications (1)

Publication Number Publication Date
FR725882A true FR725882A (en) 1932-05-19

Family

ID=10355168

Family Applications (1)

Application Number Title Priority Date Filing Date
FR725882D Expired FR725882A (en) 1930-11-08 1931-11-07 Improvements to telephone transmitters

Country Status (2)

Country Link
FR (1) FR725882A (en)
GB (1) GB366955A (en)

Also Published As

Publication number Publication date
GB366955A (en) 1932-02-08

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