A fluid mixer for submerging within a body of liquid to transfer and mix the fluid in the body of liquid. The mixer does not draw liquid through an opening and has no sharp corners so debris within the body of liquid cannot plug the mixer. The apparatus comprises a rotatable shaft with a hollow passage...http://www.google.fr/patents/US5160459?utm_source=gb-gplus-shareBrevet US5160459 - Fluid mixer
