Williams Controls, Inc., together with its subsidiaries, engages in the design, manufacture, and sale of electronic throttle controls, pneumatic controls, and electronic sensors for heavy trucks, transit buses, off-road equipment, and military applications worldwide. The company’s electronic throttle control systems send a signal proportional to throttle position to adjust the speed of electronically controlled engines. Its pneumatic control systems are used for vehicle control system applications, such as power take-offs and air-control applications. The company also designs and manufactures a line of adjustable foot pedals and arm rests for medium and heavy truck, and transit bus markets, as well as joysticks primarily to the off-road market. Williams Controls, Inc. sells its products directly to heavy truck, transit bus, and off-road original equipment manufacturers, as well as through a network of independent distributors and representatives, which sell to smaller original equipment manufacturers and to truck and bus owners as replacement parts. The company was founded in 1937 and is headquartered in Portland, Oregon. As of December 13, 2012, Williams Controls Inc. operates as a subsidiary of Curtiss-Wright Controls, Inc.