A product dispensing apparatus including a reservoir module, a dosing module and a dose setting member. The reservoir module includes a front casing section, a block, a first connector, a piston, and a piston rod moveable in a dispensing movement and against the dispensing movement, and including a return...http://www.google.com/patents/US7628773?utm_source=gb-gplus-sharePatent US7628773 - Reservoir module comprising a piston rod
