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Hisayoshi Nakatsuka

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Patents Grantslast 30 patents

  • Information Patent Grant

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    • Patent number 4,220,341
    • Issue date Sep 2, 1980
    • Ortofon Manufacturing A/S
    • Hisayoshi Nakatsuka
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Moving coil pickup having a substantially square magnetic armature...
    • Patent number 4,145,582
    • Issue date Mar 20, 1979
    • Ortofon Manufacturing A/S
    • Hisayoshi Nakatsuka
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

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    • Patent number 4,138,122
    • Issue date Feb 6, 1979
    • Ortofon Manufacturing A/S
    • Hisayoshi Nakatsuka
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE