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Dredge cutterhead
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Patent number 4,575,960
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Issue date Mar 18, 1986
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Troy M. Deal
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Rotating self-cleaning screen
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Patent number 4,521,305
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Issue date Jun 4, 1985
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Troy M. Deal
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Pump intake cutter head
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Patent number 4,434,943
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Issue date Mar 6, 1984
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Troy M. Deal
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B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...
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Dredge cutter head
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Patent number 3,971,148
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Issue date Jul 27, 1976
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Troy M. Deal
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING