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Milling apparatus
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Patent number 4,336,910
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Issue date Jun 29, 1982
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Carl Judson
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B28 - WORKING CEMENT, CLAY, OR STONE
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Hammermills
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Patent number 4,143,823
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Issue date Mar 13, 1979
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Carl Judson
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B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...