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2757904
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Patent number 2,757,904
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Issue date Aug 7, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2134374
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Patent number 2,134,374
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Issue date Oct 25, 1938
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B28 - WORKING CEMENT, CLAY, OR STONE
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1555769
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Patent number 1,555,769
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Issue date Sep 29, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE
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364826
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Patent number 364,826
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Issue date Jun 14, 1887
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B28 - WORKING CEMENT, CLAY, OR STONE