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3687144
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Patent number 3,687,144
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Issue date Aug 29, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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2496895
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Patent number 2,496,895
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Issue date Feb 7, 1950
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B28 - WORKING CEMENT, CLAY, OR STONE
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1816023
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Patent number 1,816,023
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Issue date Jul 28, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE
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1758462
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Patent number 1,758,462
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Issue date May 13, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE