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3540094
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Patent number 3,540,094
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Issue date Nov 17, 1970
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B28 - WORKING CEMENT, CLAY, OR STONE
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2346393
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Patent number 2,346,393
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Issue date Apr 11, 1944
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B28 - WORKING CEMENT, CLAY, OR STONE
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1775735
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Patent number 1,775,735
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Issue date Sep 16, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1715859
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Patent number 1,715,859
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Issue date Jun 4, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE