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3310855
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Patent number 3,310,855
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Issue date Mar 28, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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2261114
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Patent number 2,261,114
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Issue date Nov 4, 1941
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B28 - WORKING CEMENT, CLAY, OR STONE
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2069948
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Patent number 2,069,948
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Issue date Feb 9, 1937
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B28 - WORKING CEMENT, CLAY, OR STONE
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2069947
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Patent number 2,069,947
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Issue date Feb 9, 1937
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B28 - WORKING CEMENT, CLAY, OR STONE
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1981257
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Patent number 1,981,257
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Issue date Nov 20, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1880872
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Patent number 1,880,872
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Issue date Oct 4, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE
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1446330
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Patent number 1,446,330
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Issue date Feb 20, 1923
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B28 - WORKING CEMENT, CLAY, OR STONE
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1400473
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Patent number 1,400,473
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Issue date Dec 13, 1921
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B28 - WORKING CEMENT, CLAY, OR STONE
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364826
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Patent number 364,826
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Issue date Jun 14, 1887
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B28 - WORKING CEMENT, CLAY, OR STONE