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3661365
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Patent number 3,661,365
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Issue date May 9, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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3640511
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Patent number 3,640,511
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Issue date Feb 8, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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2519148
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Patent number 2,519,148
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Issue date Aug 15, 1950
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B28 - WORKING CEMENT, CLAY, OR STONE
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2491194
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Patent number 2,491,194
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Issue date Dec 13, 1949
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B28 - WORKING CEMENT, CLAY, OR STONE