A combination electrical plug and cord and power cut-off unit with a male electrical plug rigidly secured to a housing from which the cord extends, the housing serving as a hard grip for insertion and removal of the plug, the housing containing an electrical relay holding circuit including an externally...http://www.google.co.uk/patents/US4086643?utm_source=gb-gplus-sharePatent US4086643 - Combination plug and power cut-off unit
