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Apparatus for treating blocks
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Patent number 6,685,459
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Issue date Feb 3, 2004
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Hess Maschinenfabrik GmbH & Co. KG
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Walter Hess
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B28 - WORKING CEMENT, CLAY, OR STONE
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2146957
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Patent number 2,146,957
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Issue date Feb 14, 1939
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B28 - WORKING CEMENT, CLAY, OR STONE