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3429726
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Patent number 3,429,726
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Issue date Feb 25, 1969
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B28 - WORKING CEMENT, CLAY, OR STONE
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3139270
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Patent number 3,139,270
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Issue date Jun 30, 1964
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B28 - WORKING CEMENT, CLAY, OR STONE
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3098640
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Patent number 3,098,640
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Issue date Jul 23, 1963
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B28 - WORKING CEMENT, CLAY, OR STONE
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2516436
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Patent number 2,516,436
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Issue date Jul 25, 1950
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B28 - WORKING CEMENT, CLAY, OR STONE
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1968691
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Patent number 1,968,691
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Issue date Jul 31, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1931956
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Patent number 1,931,956
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Issue date Oct 24, 1933
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B28 - WORKING CEMENT, CLAY, OR STONE
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1766911
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Patent number 1,766,911
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Issue date Jun 24, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE