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3717693
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Patent number 3,717,693
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Issue date Feb 20, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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3680993
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Patent number 3,680,993
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Issue date Aug 1, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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3664784
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Patent number 3,664,784
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Issue date May 23, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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3497580
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Patent number 3,497,580
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Issue date Feb 24, 1970
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B28 - WORKING CEMENT, CLAY, OR STONE
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3239587
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Patent number 3,239,587
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Issue date Mar 8, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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3010173
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Patent number 3,010,173
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Issue date Nov 28, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2932876
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Patent number 2,932,876
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Issue date Apr 19, 1960
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B28 - WORKING CEMENT, CLAY, OR STONE
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2887755
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Patent number 2,887,755
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Issue date May 26, 1959
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B28 - WORKING CEMENT, CLAY, OR STONE