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Concrete mixer
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Patent number 7,048,429
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Issue date May 23, 2006
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Kabushiki Kaisha Asami Seisakusho
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Kunio Asami
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B28 - WORKING CEMENT, CLAY, OR STONE
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Portable mixing apparatus
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Patent number 6,461,033
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Issue date Oct 8, 2002
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Douglas R. Palmer
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B28 - WORKING CEMENT, CLAY, OR STONE
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3172646
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Patent number 3,172,646
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Issue date Mar 9, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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2098483
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Patent number 2,098,483
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Issue date Nov 9, 1937
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B28 - WORKING CEMENT, CLAY, OR STONE
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1801685
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Patent number 1,801,685
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Issue date Apr 21, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE