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3298552
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Patent number 3,298,552
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Issue date Jan 17, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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2919804
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Patent number 2,919,804
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Issue date Jan 5, 1960
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B28 - WORKING CEMENT, CLAY, OR STONE
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2302255
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Patent number 2,302,255
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Issue date Nov 17, 1942
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B28 - WORKING CEMENT, CLAY, OR STONE
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2100229
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Patent number 2,100,229
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Issue date Nov 23, 1937
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B28 - WORKING CEMENT, CLAY, OR STONE
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1787716
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Patent number 1,787,716
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Issue date Jan 6, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE
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1640221
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Patent number 1,640,221
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Issue date Aug 23, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE
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1630221
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Patent number 1,630,221
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Issue date May 24, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE
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1610953
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Patent number 1,610,953
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Issue date Dec 14, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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1514032
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Patent number 1,514,032
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Issue date Nov 4, 1924
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B28 - WORKING CEMENT, CLAY, OR STONE
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1467186
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Patent number 1,467,186
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Issue date Sep 4, 1923
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B28 - WORKING CEMENT, CLAY, OR STONE