A transactional control system, a promotional system, and a redemption system including a set of a card and a removable and reusable label. The removable and reusable label having a first side printed with indicia thereon, and a second side coated with a reusable adhesive layer suitable for affixing...http://www.google.es/patents/US5997042?utm_source=gb-gplus-sharePatente US5997042 - Card with removable, reusable element
