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Method of producing concrete
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Patent number 4,795,263
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Issue date Jan 3, 1989
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Sumitomo Corporation
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Kikuo Kaga
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B28 - WORKING CEMENT, CLAY, OR STONE
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Pivoting skid blender trailer
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Patent number 4,311,395
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Issue date Jan 19, 1982
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Halliburton Company
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John L. Douthitt
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B28 - WORKING CEMENT, CLAY, OR STONE
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3910564
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Patent number 3,910,564
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Issue date Oct 7, 1975
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B28 - WORKING CEMENT, CLAY, OR STONE
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3547412
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Patent number 3,547,412
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Issue date Dec 15, 1970
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B28 - WORKING CEMENT, CLAY, OR STONE
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3369798
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Patent number 3,369,798
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Issue date Feb 20, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3336011
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Patent number 3,336,011
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Issue date Aug 15, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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2904942
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Patent number 2,904,942
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Issue date Sep 22, 1959
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B28 - WORKING CEMENT, CLAY, OR STONE
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2179485
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Patent number 2,179,485
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Issue date Nov 14, 1939
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B28 - WORKING CEMENT, CLAY, OR STONE
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1557275
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Patent number 1,557,275
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Issue date Oct 13, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE