Donaldson Company is one of the leading providers of filtration systems and replacement parts worldwide. The firm was started in 1915 as a three-man shop manufacturing air cleaners for farm tractors. The company s engine products segment offers systems for air intake, exhaust and emissions, and liquid filtration. Its industrial products segment provides dust, fume and mist collectors, compressed air purification systems, liquid filters and parts, static and pulse-clean air filter systems, and other air filtration systems for computer disk drive, membrane and laminates. The firm serves customers in the industrial and engine markets, including dust collection, power generation, specialty filtration, compressed air purification, off-road equipment, industrial compressors, heavy trucks and light vehicles. Donaldson Company is a member of the S&P MidCap 400 Index, and is located in Minneapolis.