A vending machine, coin-operated self-service machine, utility meter etc., is provided with a counting mechanism which is inexpensive and simple in construction and easy to operate. The device comprises a binary counting device capable of storing cumulative counts of transaction information. The binary...http://www.google.de/patents/US4907250?utm_source=gb-gplus-sharePatent US4907250 - Method and apparatus for counting events in a vending machine and the like
