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3746313
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Patent number 3,746,313
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Issue date Jul 17, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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2634887
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Patent number 2,634,887
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Issue date Apr 14, 1953
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B28 - WORKING CEMENT, CLAY, OR STONE
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2153030
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Patent number 2,153,030
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Issue date Apr 4, 1939
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B28 - WORKING CEMENT, CLAY, OR STONE
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1995458
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Patent number 1,995,458
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Issue date Mar 26, 1935
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B28 - WORKING CEMENT, CLAY, OR STONE
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1735249
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Patent number 1,735,249
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Issue date Nov 12, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1723234
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Patent number 1,723,234
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Issue date Aug 6, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1657761
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Patent number 1,657,761
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Issue date Jan 31, 1928
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B28 - WORKING CEMENT, CLAY, OR STONE
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1599416
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Patent number 1,599,416
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Issue date Sep 14, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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1571544
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Patent number 1,571,544
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Issue date Feb 2, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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1563710
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Patent number 1,563,710
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Issue date Dec 1, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE
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1517430
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Patent number 1,517,430
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Issue date Dec 2, 1924
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B28 - WORKING CEMENT, CLAY, OR STONE
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1491803
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Patent number 1,491,803
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Issue date Apr 29, 1924
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B28 - WORKING CEMENT, CLAY, OR STONE
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1487468
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Patent number 1,487,468
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Issue date Mar 18, 1924
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B28 - WORKING CEMENT, CLAY, OR STONE
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1483643
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Patent number 1,483,643
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Issue date Feb 12, 1924
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B28 - WORKING CEMENT, CLAY, OR STONE
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1407333
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Patent number 1,407,333
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Issue date Feb 21, 1922
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B28 - WORKING CEMENT, CLAY, OR STONE
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1378572
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Patent number 1,378,572
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Issue date May 17, 1921
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B28 - WORKING CEMENT, CLAY, OR STONE