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-
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3298552
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Patent number 3,298,552
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Issue date Jan 17, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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3145977
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Patent number 3,145,977
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Issue date Aug 25, 1964
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B28 - WORKING CEMENT, CLAY, OR STONE
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2797835
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Patent number 2,797,835
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Issue date Jul 2, 1957
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B28 - WORKING CEMENT, CLAY, OR STONE
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2740539
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Patent number 2,740,539
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Issue date Apr 3, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2431047
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Patent number 2,431,047
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Issue date Nov 18, 1947
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B28 - WORKING CEMENT, CLAY, OR STONE
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1761801
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Patent number 1,761,801
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Issue date Jun 3, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1661244
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Patent number 1,661,244
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Issue date Mar 6, 1928
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B28 - WORKING CEMENT, CLAY, OR STONE
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1617820
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Patent number 1,617,820
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Issue date Feb 15, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE
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1449733
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Patent number 1,449,733
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Issue date Mar 27, 1923
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B28 - WORKING CEMENT, CLAY, OR STONE
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1335934
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Patent number 1,335,934
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Issue date Apr 6, 1920
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B28 - WORKING CEMENT, CLAY, OR STONE