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Filter lift system
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Patent number 4,472,273
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Issue date Sep 18, 1984
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Tadashi Hagihara
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Array of filter elements
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Patent number 4,323,451
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Issue date Apr 6, 1982
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Tadashi Hagihara
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Filtering scraper
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Patent number 4,220,540
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Issue date Sep 2, 1980
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Tadashi Hagihara
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Rotary filter apparatus
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Patent number 4,188,294
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Issue date Feb 12, 1980
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Tadashi Hagihara
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING