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Embedment roll device
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Patent number 7,513,768
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Issue date Apr 7, 2009
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United States Gypsum Company
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Michael J. Porter
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B28 - WORKING CEMENT, CLAY, OR STONE
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3318584
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Patent number 3,318,584
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Issue date May 9, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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1713554
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Patent number 1,713,554
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Issue date May 21, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE