Ampco-Pittsburgh Corporation. The Group's principal activities are carried out by three business segments: Forged and Cast Rolls, Air and Liquid Processing and Plastics Processing Machinery. Forged and Cast Rolls segment produces forged hardened steel rolls and cast rolls for the producers of steel, aluminum and other metals. Air and Liquid Processing segment produces plate finned heat exchange coils and air handling systems for the commercial and industrial construction, process and utility industries. It also manufactures refrigeration centrifugal pumps for the power generation and marine defense industries. Plastics Processing Machinery segment produces feed screws, barrels, chill rolls and heat transfer rolls for the plastic processing industry. Manufacturing plants are located in Pennsylvania, Virginia, New York, Ohio and the United Kingdom. Forged & Cast Roll accounted for 45% of 2002 revenues; Air & Liquid Processing, 43% and Plastics Processing Machinery, 12%.