TREA

Gramophone pick-ups using a stylus Recorders using a stylus

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  • CPC
  • H04R21/04
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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

H04R21/04Gramophone pick-ups using a stylus Recorders using a stylus
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    3691316
    • Patent number 3,691,316
    • Issue date Sep 12, 1972
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3673354
    • Patent number 3,673,354
    • Issue date Jun 27, 1972
    • G01 - MEASURING TESTING
  • Information Patent Grant

    3501732
    • Patent number 3,501,732
    • Issue date Mar 17, 1970
    • G01 - MEASURING TESTING
  • Information Patent Grant

    3475565
    • Patent number 3,475,565
    • Issue date Oct 28, 1969
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3392358
    • Patent number 3,392,358
    • Issue date Jul 9, 1968
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3378648
    • Patent number 3,378,648
    • Issue date Apr 16, 1968
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3295085
    • Patent number 3,295,085
    • Issue date Dec 27, 1966
    • G01 - MEASURING TESTING
  • Information Patent Grant

    3182492
    • Patent number 3,182,492
    • Issue date May 11, 1965
    • G01 - MEASURING TESTING
  • Information Patent Grant

    3138850
    • Patent number 3,138,850
    • Issue date Jun 30, 1964
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2786898
    • Patent number 2,786,898
    • Issue date Mar 26, 1957
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2769038
    • Patent number 2,769,038
    • Issue date Oct 30, 1956
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2711446
    • Patent number 2,711,446
    • Issue date Jun 21, 1955
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2711447
    • Patent number 2,711,447
    • Issue date Jun 21, 1955
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2703822
    • Patent number 2,703,822
    • Issue date Mar 8, 1955
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2671153
    • Patent number 2,671,153
    • Issue date Mar 2, 1954
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2648726
    • Patent number 2,648,726
    • Issue date Aug 11, 1953
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2645683
    • Patent number 2,645,683
    • Issue date Jul 14, 1953
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2590439
    • Patent number 2,590,439
    • Issue date Mar 25, 1952
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2568673
    • Patent number 2,568,673
    • Issue date Sep 18, 1951
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2545737
    • Patent number 2,545,737
    • Issue date Mar 20, 1951
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2511664
    • Patent number 2,511,664
    • Issue date Jun 13, 1950
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2511665
    • Patent number 2,511,665
    • Issue date Jun 13, 1950
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2491794
    • Patent number 2,491,794
    • Issue date Dec 20, 1949
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2482467
    • Patent number 2,482,467
    • Issue date Sep 20, 1949
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2476848
    • Patent number 2,476,848
    • Issue date Jul 19, 1949
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2472770
    • Patent number 2,472,770
    • Issue date Jun 7, 1949
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2471601
    • Patent number 2,471,601
    • Issue date May 31, 1949
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2429137
    • Patent number 2,429,137
    • Issue date Oct 14, 1947
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2415403
    • Patent number 2,415,403
    • Issue date Feb 11, 1947
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2382692
    • Patent number 2,382,692
    • Issue date Aug 14, 1945
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE