An apparatus for containing a fluid, said apparatus comprising (d) at least two internal chambers, (f) a fluid product line leading from each chamber to (g) a junction for product lines from at least two of said chambers to produce a mixed product, (h) means for delivering a desired ratio of fluid products...http://www.google.es/patents/US6789699?utm_source=gb-gplus-sharePatente US6789699 - Dispenser and method of use
