| 摘要 |
PROBLEM TO BE SOLVED: To provide master/slave cards which are strong against stains and not to become unusable even in the case that a card surface is stained and not to be illegally used. SOLUTION: A customer card is for letting a shop side perform one-to-one marketing to customers, recognize the purchase trend of the customers and attach IDs to the customers in a shopping center, a supermarket and a retail store, etc. The card is provided with a master card and one, two or more slave cards separably connected to each other, a non-contact IC tag is loaded on the master card and the slave cards respectively and the same recognition code is stored in the respective non-contact IC tags. |
