Donaldson Co., Inc. engages in the manufacture of filtration systems and replacement parts. It operates through the following segments: Engine Products and Industrial Products. The Engine Products segment includes replacement filters for both air and liquid filtration applications, air filtration systems, liquid filtration systems for fuel, lube and hydraulic applications, and exhaust and emissions systems. The Industrial Products segment consist of dust, fume and mist collectors, compressed air purification systems, air filtration systems for gas turbines, polytetrafluoroethylene membrane-based products, and specialized air and gas filtration systems for applications as well as hard disk drives, and semi-conductor manufacturing. The company was founded by Frank Donaldson in 1915 and is headquartered in Minneapolis, MN.