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3847535
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Patent number 3,847,535
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Issue date Nov 12, 1974
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B28 - WORKING CEMENT, CLAY, OR STONE
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3562879
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Patent number 3,562,879
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Issue date Feb 16, 1971
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B28 - WORKING CEMENT, CLAY, OR STONE
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3549737
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Patent number 3,549,737
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Issue date Dec 22, 1970
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B28 - WORKING CEMENT, CLAY, OR STONE
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3540094
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Patent number 3,540,094
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Issue date Nov 17, 1970
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B28 - WORKING CEMENT, CLAY, OR STONE
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3530552
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Patent number 3,530,552
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Issue date Sep 29, 1970
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B28 - WORKING CEMENT, CLAY, OR STONE
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3363042
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Patent number 3,363,042
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Issue date Jan 9, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3212154
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Patent number 3,212,154
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Issue date Oct 19, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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2795027
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Patent number 2,795,027
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Issue date Jun 11, 1957
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B28 - WORKING CEMENT, CLAY, OR STONE
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2795028
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Patent number 2,795,028
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Issue date Jun 11, 1957
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B28 - WORKING CEMENT, CLAY, OR STONE
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2775015
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Patent number 2,775,015
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Issue date Dec 25, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2770861
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Patent number 2,770,861
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Issue date Nov 20, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2693016
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Patent number 2,693,016
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Issue date Nov 2, 1954
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B28 - WORKING CEMENT, CLAY, OR STONE
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2645835
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Patent number 2,645,835
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Issue date Jul 21, 1953
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B28 - WORKING CEMENT, CLAY, OR STONE
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2611941
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Patent number 2,611,941
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Issue date Sep 30, 1952
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B28 - WORKING CEMENT, CLAY, OR STONE
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2598913
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Patent number 2,598,913
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Issue date Jun 3, 1952
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B28 - WORKING CEMENT, CLAY, OR STONE
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2549686
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Patent number 2,549,686
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Issue date Apr 17, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE
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2480442
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Patent number 2,480,442
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Issue date Aug 30, 1949
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B28 - WORKING CEMENT, CLAY, OR STONE
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2344959
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Patent number 2,344,959
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Issue date Mar 28, 1944
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B28 - WORKING CEMENT, CLAY, OR STONE
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2334027
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Patent number 2,334,027
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Issue date Nov 9, 1943
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B28 - WORKING CEMENT, CLAY, OR STONE