A universal adapter includes a casing, a plurality of plugs formed on one side of the casing having different-shaped plug pins adapted to be plugged in different sockets of multiple nations around the world, a converter selected from a transformer, a rectifier or both mounted in the casing for transforming...http://www.google.fr/patents/US5159545?utm_source=gb-gplus-shareBrevet US5159545 - Universal adapter
