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3517424
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Patent number 3,517,424
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Issue date Jun 30, 1970
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B28 - WORKING CEMENT, CLAY, OR STONE
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3343236
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Patent number 3,343,236
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Issue date Sep 26, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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3176370
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Patent number 3,176,370
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Issue date Apr 6, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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3164876
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Patent number 3,164,876
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Issue date Jan 12, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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3161935
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Patent number 3,161,935
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Issue date Dec 22, 1964
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B28 - WORKING CEMENT, CLAY, OR STONE
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3017810
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Patent number 3,017,810
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Issue date Jan 23, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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2893099
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Patent number 2,893,099
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Issue date Jul 7, 1959
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B28 - WORKING CEMENT, CLAY, OR STONE
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2712679
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Patent number 2,712,679
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Issue date Jul 12, 1955
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B28 - WORKING CEMENT, CLAY, OR STONE
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2675597
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Patent number 2,675,597
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Issue date Apr 20, 1954
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B28 - WORKING CEMENT, CLAY, OR STONE
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2483498
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Patent number 2,483,498
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Issue date Oct 4, 1949
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B28 - WORKING CEMENT, CLAY, OR STONE
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2313825
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Patent number 2,313,825
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Issue date Mar 16, 1943
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B28 - WORKING CEMENT, CLAY, OR STONE
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2242690
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Patent number 2,242,690
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Issue date May 20, 1941
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B28 - WORKING CEMENT, CLAY, OR STONE
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2232287
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Patent number 2,232,287
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Issue date Feb 18, 1941
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B28 - WORKING CEMENT, CLAY, OR STONE
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2185613
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Patent number 2,185,613
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Issue date Jan 2, 1940
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B28 - WORKING CEMENT, CLAY, OR STONE
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2134614
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Patent number 2,134,614
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Issue date Oct 25, 1938
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B28 - WORKING CEMENT, CLAY, OR STONE
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2130551
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Patent number 2,130,551
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Issue date Sep 20, 1938
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B28 - WORKING CEMENT, CLAY, OR STONE
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1961981
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Patent number 1,961,981
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Issue date Jun 5, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1868398
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Patent number 1,868,398
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Issue date Jul 19, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE
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1783885
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Patent number 1,783,885
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Issue date Dec 2, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1750138
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Patent number 1,750,138
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Issue date Mar 11, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1723856
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Patent number 1,723,856
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Issue date Aug 6, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1610990
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Patent number 1,610,990
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Issue date Dec 14, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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1597220
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Patent number 1,597,220
-
Issue date Aug 24, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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1582406
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Patent number 1,582,406
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Issue date Apr 27, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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1563615
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Patent number 1,563,615
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Issue date Dec 1, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE
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1553842
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Patent number 1,553,842
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Issue date Sep 15, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE
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1523937
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Patent number 1,523,937
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Issue date Jan 20, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE
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1504834
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Patent number 1,504,834
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Issue date Aug 12, 1924
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B28 - WORKING CEMENT, CLAY, OR STONE
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1453269
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Patent number 1,453,269
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Issue date May 1, 1923
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B28 - WORKING CEMENT, CLAY, OR STONE