Parker-Hannifin Corp. engages in the manufacture of motion and control technologies and systems. It operates through Diversified Industrial and Aerospace segments. The Diversified Industrial segment sells products to both original equipment manufacturers and distributors who serve the replacement markets in manufacturing, packaging, processing, transportation, mobile construction, refrigeration and air conditioning, agricultural and military machinery, and equipment industries. The Aerospace segment offers products primarily in the commercial and military aerospace markets to both OEMs and to end users for spares, maintenance, repair, and overhaul. The company was founded by Arthur L. Parker in 1918 and is headquartered in Cleveland, OH.