The present invention relates to a system for automating data acquisition and processing at a checkstand point-of-sale in a retail outlet. Preferred embodiments include a first local area network of POS terminals for initiating merchandise purchase transactions. All of the purchase transactions in the...http://www.google.com.hk/patents/US5256863?utm_source=gb-gplus-share專利 US5256863 - In-store universal control system
