Operate or tend machines, such as filter presses, shaker screens, centrifuges, condenser tubes, precipitator tanks, fermenting tanks, evaporating tanks, scrubbing towers, and batch stills, to extract, sort, or separate liquids, gases, or solid materials from other materials in order to recover a refined product or material.

1992 employment: 21,000 Projected 1992-2005 employment change: Expected to decline

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