A display device includes a plug device having a housing engageable into a hole of an article for sales, the housing includes a chamber and a spring blade having a projection to engage into a depression of the article, and for detachably attaching the housing to the article. A hanger device includes...http://www.google.fr/patents/US20050230587?utm_source=gb-gplus-shareBrevet US20050230587 - Display device for article for sale
