A liquid dispenser for selectively dispensing a plurality of different liquids includes a separate reservoir for each of the fluids, and a separate nozzle for dispensing each of the fluids. A separate hydraulic dispensing system having a cylinder containing a piston is connected to each reservoir and...http://www.google.es/patents/US4878601?utm_source=gb-gplus-sharePatente US4878601 - Liquid dispenser
