A bill and coin changer in which a circuit employing a programmed microcomputer controls the bill-validating and coin-dispensing procedures and searches for faults in the operation of the sensors and electromechanical components of the changer. During bill validation, a bill is moved at a predetermined...http://www.google.se/patents/US4470496?utm_source=gb-gplus-sharePatent US4470496 - Control circuit for bill and coin changer
