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3811814
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Patent number 3,811,814
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Issue date May 21, 1974
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B28 - WORKING CEMENT, CLAY, OR STONE
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3767746
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Patent number 3,767,746
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Issue date Oct 23, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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3548452
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Patent number 3,548,452
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Issue date Dec 22, 1970
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B28 - WORKING CEMENT, CLAY, OR STONE
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3520967
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Patent number 3,520,967
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Issue date Jul 21, 1970
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B28 - WORKING CEMENT, CLAY, OR STONE
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2111577
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Patent number 2,111,577
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Issue date Mar 22, 1938
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B28 - WORKING CEMENT, CLAY, OR STONE
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1982891
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Patent number 1,982,891
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Issue date Dec 4, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1647015
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Patent number 1,647,015
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Issue date Oct 25, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE
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1329292
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Patent number 1,329,292
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Issue date Jan 27, 1920
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B28 - WORKING CEMENT, CLAY, OR STONE