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WSCI: WSI Industries, Inc. engages in precision contract metal machining business in the United States. The company offers metal components in medium to high volumes requiring tolerances in accordance with customer specifications. It primarily serves aerospace/avionics/defense, recreational vehicles, energy, and bioscience industries. The company was founded in 1950 and is headquartered in Monticello, Minnesota. 

AP: Ampco-Pittsburgh Corporation and its subsidiaries manufacture and sell custom-engineered equipment in the United States and internationally. It operates in two segments, Forged and Cast Rolls, and Air and Liquid Processing. The Forged and Cast Rolls segment produces forged hardened steel rolls used in cold rolling for the producers of steel, aluminum, and other metals; and cast iron and steel rolls for hot and cold strip mills, medium/heavy section mills, and plate mills. The Air and Liquid Processing segment manufactures finned tube and plate finned heat exchange coils for the commercial and industrial construction, as well as for process and utility industries; custom air handling systems used in commercial, institutional, and industrial buildings; and a line of centrifugal pumps for the refrigeration, power generation, and marine defense industries. The company was founded in 1929 and is based in Pittsburgh, Pennsylvania.

MPR: Met-Pro Corporation manufactures and sells product recovery and pollution control equipment for purification of air and liquids, fluid handling equipment for corrosive, abrasive and high temperature liquids, and filtration and purification products in the United States and internationally. The company's Product Recovery/Pollution Control Technologies segment provides solutions and products for product recovery and pollution control applications in metal finishing and plating, wastewater treatment, composting, food processing, ethanol production, chemical, petrochemical, printed circuit, semiconductor, steel pickling, battery manufacturing, groundwater remediation, automotive, aerospace, furniture, painting, electronics, printing, plastics, pulp and paper, fertilizer, pesticides, electric utility, aquaculture, commercial marine/navy, and pharmaceutical industries. It also designs and manufactures exhaust systems for laboratory fume hoods in university, public health, government, chemical, pharmaceutical, industrial, and other process industries; and provides aftermarket field services, including installation, preventative maintenance, trouble shooting, repair, upgrade, and performance testing. The company's Fluid Handling Technologies segment manufactures horizontal, vertical, and in-tank centrifugal pumps that handle corrosive, abrasive, and high temperature liquids to hospitals, universities, and laboratories. Its Filtration/Purification Technologies segment provides chemicals for the treatment of municipal drinking water systems, boiler and cooling tower systems, cartridges and filter housings, and filtration products for industrial air and liquid applications. The company's Mefiag Filtration Technologies segment manufactures filtration systems utilizing primarily horizontal disc technology. It sells its products through its own personnel, distributors, representatives, and agents. The company was founded in 1966 and is based in Harleysville, Pennsylvania.