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3743470
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Patent number 3,743,470
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Issue date Jul 3, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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3413191
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Patent number 3,413,191
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Issue date Nov 26, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3369066
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Patent number 3,369,066
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Issue date Feb 13, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3216715
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Patent number 3,216,715
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Issue date Nov 9, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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3000776
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Patent number 3,000,776
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Issue date Sep 19, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2983020
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Patent number 2,983,020
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Issue date May 9, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2813544
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Patent number 2,813,544
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Issue date Nov 19, 1957
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B28 - WORKING CEMENT, CLAY, OR STONE
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2778285
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Patent number 2,778,285
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Issue date Jan 22, 1957
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B28 - WORKING CEMENT, CLAY, OR STONE
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2725797
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Patent number 2,725,797
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Issue date Dec 6, 1955
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B28 - WORKING CEMENT, CLAY, OR STONE
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2649133
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Patent number 2,649,133
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Issue date Aug 18, 1953
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B28 - WORKING CEMENT, CLAY, OR STONE
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2334807
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Patent number 2,334,807
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Issue date Nov 23, 1943
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B28 - WORKING CEMENT, CLAY, OR STONE
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2294278
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Patent number 2,294,278
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Issue date Aug 25, 1942
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B28 - WORKING CEMENT, CLAY, OR STONE
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2275535
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Patent number 2,275,535
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Issue date Mar 10, 1942
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B28 - WORKING CEMENT, CLAY, OR STONE
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2177810
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Patent number 2,177,810
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Issue date Oct 31, 1939
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B28 - WORKING CEMENT, CLAY, OR STONE
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2113096
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Patent number 2,113,096
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Issue date Apr 5, 1938
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B28 - WORKING CEMENT, CLAY, OR STONE
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1984073
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Patent number 1,984,073
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Issue date Dec 11, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1954902
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Patent number 1,954,902
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Issue date Apr 17, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1871917
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Patent number 1,871,917
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Issue date Aug 16, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE
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1786215
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Patent number 1,786,215
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Issue date Dec 23, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE