whereby said piston shoes form multidirectional hydrodynamic bearing shoes for forewards and rearwards directed {HEAD ~ movements} of {TAIL ~ said piston shoes} by said curved face portions with said bearing face radii by the extension of said curved face portions equally symmetrical in both peripheral directions away from said middle between the front and rear ends of said respective face portion 
whereby said piston shoes form multidirectional hydrodynamic bearing shoes for forewards and rearwards directed { HEAD ~ movements } of { TAIL ~ said piston shoes } by said curved face portions with said bearing face radii by the extension of said curved face portions equally symmetrical in both peripheral directions away from said middle between the front and rear ends of said respective face portion
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH