An IC card system according to this invention adopts a so-called intelligent-type IC card which has an internal power source of its own, can store designation data using the power source, and can display the storage content on a display unit. When the IC card is inserted in a terminal, the presence/absence...http://www.google.com.tw/patents/US4794236?utm_source=gb-gplus-share專利 US4794236 - IC card system
