A totalizer for recording the income of a multiprice vending machine, the totalizer including a device to determine the value of the item selected, the fact that a sale was made, and a counter to total the value of all items selected. The totalizer preferably verifies the correctness of the value of...http://www.google.com/patents/US4143749?utm_source=gb-gplus-sharePatent US4143749 - Totalizer for vending machine
