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3822106
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Patent number 3,822,106
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Issue date Jul 2, 1974
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B28 - WORKING CEMENT, CLAY, OR STONE
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3388039
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Patent number 3,388,039
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Issue date Jun 11, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3161934
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Patent number 3,161,934
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Issue date Dec 22, 1964
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B28 - WORKING CEMENT, CLAY, OR STONE
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3041699
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Patent number 3,041,699
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Issue date Jul 3, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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3010511
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Patent number 3,010,511
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Issue date Nov 28, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2962790
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Patent number 2,962,790
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Issue date Dec 6, 1960
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B28 - WORKING CEMENT, CLAY, OR STONE
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2914834
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Patent number 2,914,834
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Issue date Dec 1, 1959
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B28 - WORKING CEMENT, CLAY, OR STONE
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2653370
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Patent number 2,653,370
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Issue date Sep 29, 1953
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B28 - WORKING CEMENT, CLAY, OR STONE
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2331000
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Patent number 2,331,000
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Issue date Oct 5, 1943
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B28 - WORKING CEMENT, CLAY, OR STONE
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2109078
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Patent number 2,109,078
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Issue date Feb 22, 1938
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B28 - WORKING CEMENT, CLAY, OR STONE