A POS system includes a center file and a file control unit, and a plurality of electronic cash registers each including a memory having a predetermined number of data areas each for storing article data, and a control circuit which, when it is detected that the article data corresponding to the input...http://www.google.es/patents/US4870577?utm_source=gb-gplus-sharePatente US4870577 - ECR in which article data stored in a memory is altered according to sales data
ECR in which article data stored in a memory is altered according to sales data
