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Golf club head
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Patent number 6,162,130
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Issue date Dec 19, 2000
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Tsuyoshi Masumoto
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Tsuyoshi Masumoto
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A63 - SPORTS GAMES AMUSEMENTS
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High-strength magnesium-based alloy
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Patent number 5,340,416
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Issue date Aug 23, 1994
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Tsuyoshi Masumoto
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Toshisuke Shibata
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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High strength magnesium-based alloys
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Patent number 5,221,376
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Issue date Jun 22, 1993
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Tsuyoshi Masumoto
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Tsuyoshi Masumoto
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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Ni-Cr type alloy material
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Patent number 4,655,857
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Issue date Apr 7, 1987
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Tsuyoshi Masumoto
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Tsuyoshi Masumoto
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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