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3628738
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Patent number 3,628,738
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Issue date Dec 21, 1971
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B28 - WORKING CEMENT, CLAY, OR STONE
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3599879
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Patent number 3,599,879
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Issue date Aug 17, 1971
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B28 - WORKING CEMENT, CLAY, OR STONE
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3395895
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Patent number 3,395,895
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Issue date Aug 6, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3326815
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Patent number 3,326,815
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Issue date Jun 20, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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3310614
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Patent number 3,310,614
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Issue date Mar 21, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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3171718
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Patent number 3,171,718
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Issue date Mar 2, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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3034859
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Patent number 3,034,859
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Issue date May 15, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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2916214
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Patent number 2,916,214
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Issue date Dec 8, 1959
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B28 - WORKING CEMENT, CLAY, OR STONE
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2915412
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Patent number 2,915,412
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Issue date Dec 1, 1959
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B28 - WORKING CEMENT, CLAY, OR STONE
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2904267
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Patent number 2,904,267
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Issue date Sep 15, 1959
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B28 - WORKING CEMENT, CLAY, OR STONE
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2413330
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Patent number 2,413,330
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Issue date Dec 31, 1946
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B28 - WORKING CEMENT, CLAY, OR STONE
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2249570
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Patent number 2,249,570
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Issue date Jul 15, 1941
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B28 - WORKING CEMENT, CLAY, OR STONE
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2164052
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Patent number 2,164,052
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Issue date Jun 27, 1939
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B28 - WORKING CEMENT, CLAY, OR STONE
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2085537
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Patent number 2,085,537
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Issue date Jun 29, 1937
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B28 - WORKING CEMENT, CLAY, OR STONE
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1930247
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Patent number 1,930,247
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Issue date Oct 10, 1933
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B28 - WORKING CEMENT, CLAY, OR STONE
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1907690
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Patent number 1,907,690
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Issue date May 9, 1933
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B28 - WORKING CEMENT, CLAY, OR STONE
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1888701
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Patent number 1,888,701
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Issue date Nov 22, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE
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1366456
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Patent number 1,366,456
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Issue date Jan 25, 1921
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B28 - WORKING CEMENT, CLAY, OR STONE