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Water purifier
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Patent number 4,732,674
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Issue date Mar 22, 1988
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Hitachi, Ltd.
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Kozo Tamura
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Water purifier
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Patent number 4,678,571
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Issue date Jul 7, 1987
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Hitachi, Ltd.
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Nobuyoshi Hosaka
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE