TREA

in which the sound is perpendicular to the current crossing the transducer material

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  • CPC
  • H04R21/026
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Parent Industries

HELECTRICITY H04Electric communication H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS DEAF-AID SETS PUBLIC ADDRESS SYSTEMS H04R21/00Variable-resistance transducers

Current Industry

H04R21/026in which the sound is perpendicular to the current crossing the transducer material
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    2168569
    • Patent number 2,168,569
    • Issue date Aug 8, 1939
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2140859
    • Patent number 2,140,859
    • Issue date Dec 20, 1938
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1865210
    • Patent number 1,865,210
    • Issue date Jun 28, 1932
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1829203
    • Patent number 1,829,203
    • Issue date Oct 27, 1931
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1748928
    • Patent number 1,748,928
    • Issue date Feb 25, 1930
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1711410
    • Patent number 1,711,410
    • Issue date Apr 30, 1929
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1634210
    • Patent number 1,634,210
    • Issue date Jun 28, 1927
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1616414
    • Patent number 1,616,414
    • Issue date Feb 1, 1927
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1493415
    • Patent number 1,493,415
    • Issue date May 6, 1924
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1459005
    • Patent number 1,459,005
    • Issue date Jun 19, 1923
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1354229
    • Patent number 1,354,229
    • Issue date Sep 28, 1920
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE