A central station is connected to a ring bus system to which a number of separately addressable loads are connected through specific load receivers. The central station has a switching system by operation of selected switches of which, specific loads can be addressed. The ring bus system has a power...http://www.google.co.uk/patents/US4155075?utm_source=gb-gplus-sharePatent US4155075 - Remote control system for selective load switching, specifically for automotive vehicles
