A vanity mirror mounted to a vehicular visor via a mirror frame of electrically insulating material has a pair of illuminating lamps on its opposite sides. The lamps have their opposite polarity terminals electrically coupled to, and mechanically supported by, a pair of sheet-metal power conductors and...http://www.google.es/patents/US4764852?utm_source=gb-gplus-sharePatente US4764852 - Power circuit arrangement for illuminating a vanity mirror built into a visor
Power circuit arrangement for illuminating a vanity mirror built into a visor