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Mortar mixing apparatus
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Patent number 7,784,996
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Issue date Aug 31, 2010
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Thomas J. Cummer
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B28 - WORKING CEMENT, CLAY, OR STONE
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Portable continual mixer
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Patent number 5,609,416
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Issue date Mar 11, 1997
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Donald L. Duckworth
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B28 - WORKING CEMENT, CLAY, OR STONE
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Portable continual mixer
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Patent number 5,470,147
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Issue date Nov 28, 1995
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Donald L. Duckworth
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B28 - WORKING CEMENT, CLAY, OR STONE
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3211436
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Patent number 3,211,436
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Issue date Oct 12, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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2054042
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Patent number 2,054,042
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Issue date Sep 8, 1936
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B28 - WORKING CEMENT, CLAY, OR STONE
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1714588
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Patent number 1,714,588
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Issue date May 28, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1633682
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Patent number 1,633,682
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Issue date Jun 28, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE