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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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3300193
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Patent number 3,300,193
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Issue date Jan 24, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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2354634
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Patent number 2,354,634
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Issue date Jul 25, 1944
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B28 - WORKING CEMENT, CLAY, OR STONE
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2296505
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Patent number 2,296,505
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Issue date Sep 22, 1942
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B28 - WORKING CEMENT, CLAY, OR STONE
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2102584
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Patent number 2,102,584
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Issue date Dec 21, 1937
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B28 - WORKING CEMENT, CLAY, OR STONE
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2005950
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Patent number 2,005,950
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Issue date Jun 25, 1935
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B28 - WORKING CEMENT, CLAY, OR STONE