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3852018
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Patent number 3,852,018
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Issue date Dec 3, 1974
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B28 - WORKING CEMENT, CLAY, OR STONE
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3728065
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Patent number 3,728,065
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Issue date Apr 17, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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3368011
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Patent number 3,368,011
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Issue date Feb 6, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3340337
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Patent number 3,340,337
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Issue date Sep 5, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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2715360
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Patent number 2,715,360
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Issue date Aug 16, 1955
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B28 - WORKING CEMENT, CLAY, OR STONE
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2591267
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Patent number 2,591,267
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Issue date Apr 1, 1952
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B28 - WORKING CEMENT, CLAY, OR STONE
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2361933
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Patent number 2,361,933
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Issue date Nov 7, 1944
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B28 - WORKING CEMENT, CLAY, OR STONE
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1876444
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Patent number 1,876,444
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Issue date Sep 6, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE