An appliance switching system is used in combination with a duplex electric outlet having a first receptacle that is constantly energized and a second receptacle that is selectively energized and de-energized by operation of a wall switch. The system includes first and second plugs for electrically engaging...http://www.google.fr/patents/US20010030470?utm_source=gb-gplus-shareBrevet US20010030470 - Appliance switching system
