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3038691
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Patent number 3,038,691
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Issue date Jun 12, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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2828765
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Patent number 2,828,765
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Issue date Apr 1, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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2697637
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Patent number 2,697,637
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Issue date Dec 21, 1954
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B28 - WORKING CEMENT, CLAY, OR STONE
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2673011
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Patent number 2,673,011
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Issue date Mar 23, 1954
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B28 - WORKING CEMENT, CLAY, OR STONE
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2667288
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Patent number 2,667,288
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Issue date Jan 26, 1954
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B28 - WORKING CEMENT, CLAY, OR STONE
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2655178
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Patent number 2,655,178
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Issue date Oct 13, 1953
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B28 - WORKING CEMENT, CLAY, OR STONE
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2563337
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Patent number 2,563,337
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Issue date Aug 7, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE
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2537585
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Patent number 2,537,585
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Issue date Jan 9, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE
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2534445
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Patent number 2,534,445
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Issue date Dec 19, 1950
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B28 - WORKING CEMENT, CLAY, OR STONE
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2533191
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Patent number 2,533,191
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Issue date Dec 5, 1950
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B28 - WORKING CEMENT, CLAY, OR STONE
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2485192
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Patent number 2,485,192
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Issue date Oct 18, 1949
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B28 - WORKING CEMENT, CLAY, OR STONE
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2443679
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Patent number 2,443,679
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Issue date Jun 22, 1948
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B28 - WORKING CEMENT, CLAY, OR STONE
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2368402
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Patent number 2,368,402
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Issue date Jan 30, 1945
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B28 - WORKING CEMENT, CLAY, OR STONE
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2360344
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Patent number 2,360,344
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Issue date Oct 17, 1944
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B28 - WORKING CEMENT, CLAY, OR STONE
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2225374
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Patent number 2,225,374
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Issue date Dec 17, 1940
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B28 - WORKING CEMENT, CLAY, OR STONE
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2222346
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Patent number 2,222,346
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Issue date Nov 19, 1940
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B28 - WORKING CEMENT, CLAY, OR STONE
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2192406
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Patent number 2,192,406
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Issue date Mar 5, 1940
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B28 - WORKING CEMENT, CLAY, OR STONE
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1967991
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Patent number 1,967,991
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Issue date Jul 24, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1956521
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Patent number 1,956,521
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Issue date Apr 24, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1908810
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Patent number 1,908,810
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Issue date May 16, 1933
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B28 - WORKING CEMENT, CLAY, OR STONE
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1839807
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Patent number 1,839,807
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Issue date Jan 5, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE
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1824189
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Patent number 1,824,189
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Issue date Sep 22, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE
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1692280
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Patent number 1,692,280
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Issue date Nov 20, 1928
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B28 - WORKING CEMENT, CLAY, OR STONE