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Roll changing apparatus of rolling mill
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Patent number 6,425,278
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Issue date Jul 30, 2002
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Mitsubishi Heavy Industries, Ltd.
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Hiroshi Aratani
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Method of joining metal pieces
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Patent number 6,252,211
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Issue date Jun 26, 2001
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Kawasaki Steel Corporation
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Shigeru Isoyama
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Double action die set for closed forging
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Patent number 4,977,773
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Issue date Dec 18, 1990
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Mitsubishi Jukogyo Kabushiki Kaisha
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Yoshiki Mito
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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