TREA

Tokyo Sanyo Elctric Co., Ltd.

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  • Gunma, JP
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  • Information Patent Grant

    Diaphragm for speaker
    • Patent number 4,128,138
    • Issue date Dec 5, 1978
    • Sanyo Electric Co., Ltd.
    • Yasuhiro Ishii
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE

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