In order to prevent channels or {HEAD ~ damage}, a preferred embodiment envisages arranging elastic piston rings having staggered orifices between {TAIL ~ the press parts} and the can wall 
In order to prevent channels or { HEAD ~ damage } , a preferred embodiment envisages arranging elastic piston rings having staggered orifices between { TAIL ~ the press parts } and the can wall
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH