TREA

Hikaru Sano

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  • Kanagawa, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Key telephone system
    • Patent number 4,754,477
    • Issue date Jun 28, 1988
    • Tamura Electric Works, Ltd.
    • Kouji Tanaka
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE