A beverage dispensing machine is provided and is of the type having a cup station, a cup holder for holding a plurality of cups, a cup delivery for delivering one of the cups at a time to the cup station, a beverage dispenser for dispensing beverage to the cup station, and controller for controlling...http://www.google.es/patents/US5139127?utm_source=gb-gplus-sharePatente US5139127 - Beverage dispenser detecting mechanism
