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Hydraulique drive device
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Patent number 6,244,048
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Issue date Jun 12, 2001
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Hitachi Construction Machinery Co., Ltd.
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Sotaro Tanaka
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Hydraulic drive system
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Patent number 5,873,245
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Issue date Feb 23, 1999
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Hitachi Construction Machinery Co., Ltd.
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Hideyo Kato
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Flow control system
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Patent number 5,460,001
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Issue date Oct 24, 1995
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Hitachi Construction Machinery Co., Ltd.
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Hideyo Kato
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Flow control valve apparatus
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Patent number 4,813,447
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Issue date Mar 21, 1989
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Hitachi Construction Machinery Co., Ltd.
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Ken Ichiryu
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G05 - CONTROLLING REGULATING