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Two-tube continuous sand muller
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Patent number 4,322,168
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Issue date Mar 30, 1982
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Carver Foundry Products
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Rodney L. Hartung
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B28 - WORKING CEMENT, CLAY, OR STONE
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3341186
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Patent number 3,341,186
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Issue date Sep 12, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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1724850
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Patent number 1,724,850
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Issue date Aug 13, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1587300
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Patent number 1,587,300
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Issue date Jun 1, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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1570086
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Patent number 1,570,086
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Issue date Jan 19, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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1423853
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Patent number 1,423,853
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Issue date Jul 25, 1922
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B28 - WORKING CEMENT, CLAY, OR STONE