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Portable mixing apparatus
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Patent number 7,229,204
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Issue date Jun 12, 2007
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George L. Haskell
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B28 - WORKING CEMENT, CLAY, OR STONE
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3253533
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Patent number 3,253,533
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Issue date May 31, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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2764392
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Patent number 2,764,392
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Issue date Sep 25, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2756975
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Patent number 2,756,975
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Issue date Jul 31, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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1747466
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Patent number 1,747,466
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Issue date Feb 18, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1645518
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Patent number 1,645,518
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Issue date Oct 18, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE
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1436262
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Patent number 1,436,262
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Issue date Nov 21, 1922
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B28 - WORKING CEMENT, CLAY, OR STONE