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3414239
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Patent number 3,414,239
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Issue date Dec 3, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3379419
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Patent number 3,379,419
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Issue date Apr 23, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3109632
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Patent number 3,109,632
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Issue date Nov 5, 1963
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B28 - WORKING CEMENT, CLAY, OR STONE
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3090607
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Patent number 3,090,607
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Issue date May 21, 1963
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B28 - WORKING CEMENT, CLAY, OR STONE
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2884232
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Patent number 2,884,232
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Issue date Apr 28, 1959
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B28 - WORKING CEMENT, CLAY, OR STONE
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2281329
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Patent number 2,281,329
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Issue date Apr 28, 1942
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B28 - WORKING CEMENT, CLAY, OR STONE
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2244765
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Patent number 2,244,765
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Issue date Jun 10, 1941
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B28 - WORKING CEMENT, CLAY, OR STONE
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2237957
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Patent number 2,237,957
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Issue date Apr 8, 1941
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B28 - WORKING CEMENT, CLAY, OR STONE
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2031149
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Patent number 2,031,149
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Issue date Feb 18, 1936
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B28 - WORKING CEMENT, CLAY, OR STONE
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1933473
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Patent number 1,933,473
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Issue date Oct 31, 1933
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B28 - WORKING CEMENT, CLAY, OR STONE
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1837287
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Patent number 1,837,287
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Issue date Dec 22, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE
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1780733
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Patent number 1,780,733
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Issue date Nov 4, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1430704
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Patent number 1,430,704
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Issue date Oct 3, 1922
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B28 - WORKING CEMENT, CLAY, OR STONE