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Vertical shaft type pump
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Patent number 5,297,927
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Issue date Mar 29, 1994
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Hitachi, Ltd.
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Kooji Aizawa
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F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
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Heat transfer member
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Patent number 5,180,001
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Issue date Jan 19, 1993
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Hitachi, Ltd.
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Ryoji Okada
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F28 - HEAT EXCHANGE IN GENERAL
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Sintering method
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Patent number 4,855,102
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Issue date Aug 8, 1989
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Hitachi, Ltd.
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Ryoji Okada
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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