Described is a removable assembly for use on a fixed surface. The assembly includes a post having a base (42) and an attachment assembly (8). The attachment assembly includes a base plate (10) and a magnet assembly (12), both capable of carrying a magnetic current. The magnet assembly includes a housing...http://www.google.es/patents/US6739567?utm_source=gb-gplus-sharePatente US6739567 - Separable magnetic attachment assembly
