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Grinding device
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Patent number 6,350,189
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Issue date Feb 26, 2002
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Nippon Dia Industry Co., Ltd.
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Minoru Tanaka
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B24 - GRINDING POLISHING
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3885357
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Patent number 3,885,357
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Issue date May 27, 1975
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B24 - GRINDING POLISHING
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3177626
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Patent number 3,177,626
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Issue date Apr 13, 1965
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B24 - GRINDING POLISHING
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2410491
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Patent number 2,410,491
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Issue date Nov 5, 1946
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B24 - GRINDING POLISHING
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2387136
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Patent number 2,387,136
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Issue date Oct 16, 1945
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B24 - GRINDING POLISHING