Ducommun Incorporated provides engineering and manufacturing services for products and applications used in the aerospace and defense, industrial, medical, and other industries in the United States. It operates through two segments, Electronic Systems and Structural Systems. The Electronic Systems segment provides cable assemblies and interconnect systems; printed circuit board assemblies; electronic, electromechanical, and mechanical components and assemblies, as well as lightning diversion systems; and radar enclosures, aircraft avionics racks, shipboard communications and control enclosures, wire harnesses, lightning diversion strips, surge suppressors, conformal shields, and other assemblies. This segment also supplies engineered products, including illuminated pushbutton switches and panels for aviation and test systems; microwave and millimeter switches and filters for radio frequency systems and test instrumentation; and motors and resolvers for motion control, as well as provides engineering service for aerospace system design, development, integration, and testing service. The Structural Systems segment designs, engineers, and manufactures contoured aluminum, titanium, and Inconel aero structure components; structural assembly products, such as winglets, engine components, and fuselage structural panels; aerodynamic systems; and metal and composite bonded structures and assemblies comprising aircraft wing spoilers, large fuselage skins, rotor blades on rotary-wing aircraft and components, flight control surfaces, engine components, ammunition handling systems, and magnetic seals. It serves commercial aircraft, military fixed-wing aircraft, military and commercial rotary-wing aircraft, and space programs. The company was founded in 1849 and is headquartered in Costa Mesa, California.