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2575092
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Patent number 2,575,092
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Issue date Nov 13, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE
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2446644
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Patent number 2,446,644
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Issue date Aug 10, 1948
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B28 - WORKING CEMENT, CLAY, OR STONE
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2257738
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Patent number 2,257,738
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Issue date Oct 7, 1941
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B28 - WORKING CEMENT, CLAY, OR STONE
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2051010
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Patent number 2,051,010
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Issue date Aug 11, 1936
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B28 - WORKING CEMENT, CLAY, OR STONE
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1915510
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Patent number 1,915,510
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Issue date Jun 27, 1933
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B28 - WORKING CEMENT, CLAY, OR STONE
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1864626
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Patent number 1,864,626
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Issue date Jun 28, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE
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1842875
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Patent number 1,842,875
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Issue date Jan 26, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE
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1749436
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Patent number 1,749,436
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Issue date Mar 4, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE