A dispenser for flexible sheet material rolls in which a first roll is supported in a dispensing position, a second roll is supported in a reserve position and a roll transfer apparatus is operative to transfer the second roll to the dispensing position upon depletion of sheet material from the first...http://www.google.es/patents/US5288032?utm_source=gb-gplus-sharePatente US5288032 - Dispenser for flexible sheet material
