The method entails disposing advertising on a cover of an apparatus for hands-free holding of an article to a hat that has a substantially stiff lower clamp with a shape contoured to match a hat and two planar surfaces to provide grip support integral with the first planar surface, a substantially stiff...http://www.google.es/patents/US7178278?utm_source=gb-gplus-sharePatente US7178278 - Method for interchangeably promoting a business on a hat
Method for interchangeably promoting a business on a hat
