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2520 Petroleum and Coal Product Manufacturing n.e.c. This Class consists of units mainly engaged in manufacturing petroleum or coal products n.e.c., including bituminous surfacing materials (except hot-mix bituminous paving), bitumen or tar treated papers, felts or foils bituminous mastics or adhesives, or refined tar. This Class also includes units mainly engaged in the recovery of lubricating oil or grease from used petroleum waste products. Exclusions / References Primary Activities
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