During the downward motion of the punch 18, as illustrated in FIG 4, the pressure exerted by the punch forces {TAIL ~ the sintered compact} to flow rearwardly in the type of backward extrusion process described in {HEAD ~ our aforementioned prior patent} 
During the downward motion of the punch 18 , as illustrated in FIG 4 , the pressure exerted by the punch forces { TAIL ~ the sintered compact } to flow rearwardly in the type of backward extrusion process described in { HEAD ~ our aforementioned prior patent }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD