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3421744
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Patent number 3,421,744
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Issue date Jan 14, 1969
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B28 - WORKING CEMENT, CLAY, OR STONE
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2494118
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Patent number 2,494,118
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Issue date Jan 10, 1950
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B28 - WORKING CEMENT, CLAY, OR STONE
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2453583
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Patent number 2,453,583
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Issue date Nov 9, 1948
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B28 - WORKING CEMENT, CLAY, OR STONE
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2271518
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Patent number 2,271,518
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Issue date Feb 3, 1942
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B28 - WORKING CEMENT, CLAY, OR STONE
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2133170
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Patent number 2,133,170
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Issue date Oct 11, 1938
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B28 - WORKING CEMENT, CLAY, OR STONE
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1853110
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Patent number 1,853,110
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Issue date Apr 12, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE
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1788053
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Patent number 1,788,053
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Issue date Jan 6, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE
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1685529
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Patent number 1,685,529
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Issue date Sep 25, 1928
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B28 - WORKING CEMENT, CLAY, OR STONE
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1648546
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Patent number 1,648,546
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Issue date Nov 8, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE
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1603620
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Patent number 1,603,620
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Issue date Oct 19, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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1582048
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Patent number 1,582,048
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Issue date Apr 27, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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1544841
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Patent number 1,544,841
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Issue date Jul 7, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE
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1487890
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Patent number 1,487,890
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Issue date Mar 25, 1924
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B28 - WORKING CEMENT, CLAY, OR STONE