An electronic personal shopping system, communicating between a store computer and a mobile terminal, for organizing a consumer's movement through a retail facility in accordance with the consumer's current location and the locations of desired items on either a shopping list or a recommended replenishment...http://www.google.com.hk/patents/US6386450?utm_source=gb-gplus-share專利 US6386450 - Electronic shopping system including customer relocation recognition
