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3261368
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Patent number 3,261,368
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Issue date Jul 19, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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2836299
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Patent number 2,836,299
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Issue date May 27, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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2621793
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Patent number 2,621,793
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Issue date Dec 16, 1952
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B28 - WORKING CEMENT, CLAY, OR STONE
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2260776
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Patent number 2,260,776
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Issue date Oct 28, 1941
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B28 - WORKING CEMENT, CLAY, OR STONE
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2128848
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Patent number 2,128,848
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Issue date Aug 30, 1938
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B28 - WORKING CEMENT, CLAY, OR STONE
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2056906
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Patent number 2,056,906
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Issue date Oct 6, 1936
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B28 - WORKING CEMENT, CLAY, OR STONE
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1725630
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Patent number 1,725,630
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Issue date Aug 20, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1585771
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Patent number 1,585,771
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Issue date May 25, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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1554821
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Patent number 1,554,821
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Issue date Sep 22, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE
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1466580
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Patent number 1,466,580
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Issue date Aug 28, 1923
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B28 - WORKING CEMENT, CLAY, OR STONE
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1366582
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Patent number 1,366,582
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Issue date Jan 25, 1921
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B28 - WORKING CEMENT, CLAY, OR STONE