A sales method, a sales system, a bar code, and a bar code system, which vary a product's price according to the period elapsed from a manufacture date/hour to time of sale and predetermined data relating to a valid period by attaching a bar code, which includes the manufacture date/hour and predetermined...http://www.google.fr/patents/US20040054634?utm_source=gb-gplus-shareBrevet US20040054634 - Sale method and system employing product price varying dependent upon valid date of product
Sale method and system employing product price varying dependent upon valid ...
