Phone: (800) 218-3712 Toll Free: (708) 354-1040 Fax: (708) 354-2820 <a href="http://www.grayhill.com/off-highway">http://www.grayhill.com/off-highway</a> Grayhill specializes in the design and manufacture of user interface components and systems, including keypads, displays and an integrated joystick/encoder.