A paper towel dispenser includes a housing with an inner chamber configured to support a paper supply and a dispensing aperture for dispensing paper from the paper supply. The paper supply includes a side that is formed by superimposed edge portions of paper from the paper supply. An indicator mechanism...http://www.google.es/patents/US7546973?utm_source=gb-gplus-sharePatente US7546973 - Low reserve indicator for a paper towel dispenser
