In a value box in an electronic money system with a high reliability which is excellent in usage efficiency and maintenance, a front door and a rear door are provided before and after a main body portion and an indicator is provided to show operating states of a door locking key and a whole value box,...http://www.google.de/patents/US6042002?utm_source=gb-gplus-sharePatent US6042002 - Holding apparatus for a plurality of IC cards facilitating transactions of electronic money among the IC cards
