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Anti-slip type electric drill chuck
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Patent number 6,554,289
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Issue date Apr 29, 2003
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Chum Power Machinery Corp.
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Yuan-Ho Lin
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Container conveying apparatus
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Patent number 6,471,038
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Issue date Oct 29, 2002
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Chum Power Machinery Corp.
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Yang Wen Yung
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Distributing/feeding device
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Patent number 6,413,034
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Issue date Jul 2, 2002
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Chum Power Machinery Corp.
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Yang Wen-Yung
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Self-locking chuck
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Patent number 6,247,706
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Issue date Jun 19, 2001
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Chum Power Machinery Corp.
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Wen-chin Kuo
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Chuck
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Patent number 5,944,328
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Issue date Aug 31, 1999
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Chum Power Machinery Corp.
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Yuan-Ho Lin
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Chuck unit of a power hand tool
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Patent number 5,934,690
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Issue date Aug 10, 1999
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Chum Power Machinery Corp.
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Yuan-Ho Lin
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR