 Later, Roubos became Dover's chief executive officer (CEO) in 1981.Another significant acquisition included Sargent Industries, a manufacturer of control devices for aerospace and industrial end-markets, purchased in 1984 for $68 million.The Sargent Aerospace & Defense unit persisted as a global supplier of precision-engineered components and aftermarket services, performing critical functions on a variety of commercial and military aircraft, submarines, and land-based vehicles.