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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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3344015
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Patent number 3,344,015
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Issue date Sep 26, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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3269888
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Patent number 3,269,888
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Issue date Aug 30, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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3120465
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Patent number 3,120,465
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Issue date Feb 4, 1964
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B28 - WORKING CEMENT, CLAY, OR STONE
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2972378
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Patent number 2,972,378
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Issue date Feb 21, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2650524
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Patent number 2,650,524
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Issue date Sep 1, 1953
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B28 - WORKING CEMENT, CLAY, OR STONE
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2610555
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Patent number 2,610,555
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Issue date Sep 16, 1952
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B28 - WORKING CEMENT, CLAY, OR STONE
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2578581
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Patent number 2,578,581
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Issue date Dec 11, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE
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2578580
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Patent number 2,578,580
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Issue date Dec 11, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE
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2578598
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Patent number 2,578,598
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Issue date Dec 11, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE
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2500923
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Patent number 2,500,923
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Issue date Mar 21, 1950
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B28 - WORKING CEMENT, CLAY, OR STONE
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2450957
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Patent number 2,450,957
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Issue date Oct 12, 1948
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B28 - WORKING CEMENT, CLAY, OR STONE
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2422344
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Patent number 2,422,344
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Issue date Jun 17, 1947
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B28 - WORKING CEMENT, CLAY, OR STONE
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2335722
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Patent number 2,335,722
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Issue date Nov 30, 1943
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B28 - WORKING CEMENT, CLAY, OR STONE