An automobile radio receiver system includes a control unit located in the passenger compartment and a remote unit, for example, in the trunk compartment of the automobile. The control unit includes a master microcomputer which controls a display and responds to keyboard inputs. The remote unit includes...http://www.google.de/patents/US4503513?utm_source=gb-gplus-sharePatent US4503513 - Radio receiver system including a control unit and a remote unit
