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2113717
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Patent number 2,113,717
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Issue date Apr 12, 1938
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B28 - WORKING CEMENT, CLAY, OR STONE
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1941491
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Patent number 1,941,491
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Issue date Jan 2, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1922501
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Patent number 1,922,501
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Issue date Aug 15, 1933
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B28 - WORKING CEMENT, CLAY, OR STONE
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1894394
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Patent number 1,894,394
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Issue date Jan 17, 1933
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B28 - WORKING CEMENT, CLAY, OR STONE
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1873041
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Patent number 1,873,041
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Issue date Aug 23, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE
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1873040
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Patent number 1,873,040
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Issue date Aug 23, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE
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1410018
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Patent number 1,410,018
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Issue date Mar 21, 1922
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B28 - WORKING CEMENT, CLAY, OR STONE
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1352931
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Patent number 1,352,931
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Issue date Sep 14, 1920
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B28 - WORKING CEMENT, CLAY, OR STONE