As shown in FIG 6, the present invention is also related to {HEAD ~ an apparatus} 50 for restricting {TAIL ~ fluid flow} 
for restricting
As shown in FIG 6 , the present invention is also related to { HEAD ~ an apparatus } 50 for restricting { TAIL ~ fluid flow }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL