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Portable concrete plant
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Patent number 5,730,523
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Issue date Mar 24, 1998
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Jeffrey D. Flood
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B28 - WORKING CEMENT, CLAY, OR STONE
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3102603
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Patent number 3,102,603
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Issue date Sep 3, 1963
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B28 - WORKING CEMENT, CLAY, OR STONE
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2922610
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Patent number 2,922,610
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Issue date Jan 26, 1960
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B28 - WORKING CEMENT, CLAY, OR STONE
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2749076
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Patent number 2,749,076
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Issue date Jun 5, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE