An apparatus for selecting, monitoring, and controlling electrically powered devices is disclosed. In one embodiment, the apparatus includes an electrically powered device having a key operating line and switching control circuitry to control usage of the electrically powered device by interrupting continuity...http://www.google.se/patents/US6618772?utm_source=gb-gplus-sharePatent US6618772 - Method and apparatus for selecting, monitoring, and controlling electrically powered devices
