The present invention relates to an improved light bulb socket structure for use in a decorative light bulb series which is provided with a rod on the bottom of the light bulb holder to embrace the electrical wires with the walls of the light bulb socket and to close the opening on the bottom of...http://www.google.ca/patents/US5722860?utm_source=gb-gplus-sharePatent US5722860 - Watertight socket structure for use in a light bulb series
