An automated transaction system employs microprocessor-bearing user cards each issued to a respective user for maintaining a history of user account transactions and a user account balance, microprocessor-bearing master cards issued to vendors for maintaining a history of master account transactions...http://www.google.co.uk/patents/US4900903?utm_source=gb-gplus-sharePatent US4900903 - Automated transaction system with insertable cards for transferring account data
Automated transaction system with insertable cards for transferring account data
