Key switches, a plane type CRT display, a modulator, a demodulator, etc. are arranged in a control board mounted on a steering wheel, while a TV camera, a character information generator, a modulator, a demodulator, etc., are arranged on the side of the vehicle body. Electric circuits on the control...http://www.google.es/patents/US4638287?utm_source=gb-gplus-sharePatente US4638287 - Vehicle-loaded display device
