A plunger stroke pipette for replaceable pipette points with a seat for the detachable mounting of a pipette point, a plunger, a cylinder in which the plunger is movably arranged, a connection channel connecting the cylinder with an opening in the seat, a driving equipment, coupled to the plunger for...http://www.google.es/patents/US8133453?utm_source=gb-gplus-sharePatente US8133453 - Plunger stroke pipette
