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3701508
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Patent number 3,701,508
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Issue date Oct 31, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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3360231
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Patent number 3,360,231
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Issue date Dec 26, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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1690462
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Patent number 1,690,462
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Issue date Nov 6, 1928
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B28 - WORKING CEMENT, CLAY, OR STONE
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1642247
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Patent number 1,642,247
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Issue date Sep 13, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE
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1561550
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Patent number 1,561,550
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Issue date Nov 17, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE