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3606652
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Patent number 3,606,652
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Issue date Sep 21, 1971
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B28 - WORKING CEMENT, CLAY, OR STONE
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3575758
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Patent number 3,575,758
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Issue date Apr 20, 1971
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B28 - WORKING CEMENT, CLAY, OR STONE
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3224629
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Patent number 3,224,629
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Issue date Dec 21, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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3068543
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Patent number 3,068,543
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Issue date Dec 18, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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3052007
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Patent number 3,052,007
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Issue date Sep 4, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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3040409
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Patent number 3,040,409
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Issue date Jun 26, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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3005248
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Patent number 3,005,248
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Issue date Oct 24, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2999292
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Patent number 2,999,292
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Issue date Sep 12, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2995796
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Patent number 2,995,796
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Issue date Aug 15, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2623258
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Patent number 2,623,258
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Issue date Dec 30, 1952
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B28 - WORKING CEMENT, CLAY, OR STONE
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2619701
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Patent number 2,619,701
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Issue date Dec 2, 1952
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B28 - WORKING CEMENT, CLAY, OR STONE
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2572200
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Patent number 2,572,200
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Issue date Oct 23, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE
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2560007
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Patent number 2,560,007
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Issue date Jul 10, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE
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2537922
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Patent number 2,537,922
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Issue date Jan 9, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE
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2489798
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Patent number 2,489,798
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Issue date Nov 29, 1949
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B28 - WORKING CEMENT, CLAY, OR STONE
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2452858
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Patent number 2,452,858
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Issue date Nov 2, 1948
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B28 - WORKING CEMENT, CLAY, OR STONE
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2416636
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Patent number 2,416,636
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Issue date Feb 25, 1947
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B28 - WORKING CEMENT, CLAY, OR STONE
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2410123
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Patent number 2,410,123
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Issue date Oct 29, 1946
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B28 - WORKING CEMENT, CLAY, OR STONE
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2374556
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Patent number 2,374,556
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Issue date Apr 24, 1945
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B28 - WORKING CEMENT, CLAY, OR STONE
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2374555
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Patent number 2,374,555
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Issue date Apr 24, 1945
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B28 - WORKING CEMENT, CLAY, OR STONE
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2355172
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Patent number 2,355,172
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Issue date Aug 8, 1944
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B28 - WORKING CEMENT, CLAY, OR STONE
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2349292
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Patent number 2,349,292
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Issue date May 23, 1944
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B28 - WORKING CEMENT, CLAY, OR STONE
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2294926
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Patent number 2,294,926
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Issue date Sep 8, 1942
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B28 - WORKING CEMENT, CLAY, OR STONE
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2217346
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Patent number 2,217,346
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Issue date Oct 8, 1940
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B28 - WORKING CEMENT, CLAY, OR STONE