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Aggregate material spreader
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Patent number 5,234,128
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Issue date Aug 10, 1993
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Francis K. Hill
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Fluid spreading apparatus
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Patent number 4,274,586
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Issue date Jun 23, 1981
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Francis K. Hill
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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