{TAIL ~ A supported membrane} is a membrane cast on a substrate, {HEAD ~ preferably a nonwoven fabric} 
{ TAIL ~ A supported membrane } is a membrane cast on a substrate , { HEAD ~ preferably a nonwoven fabric }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD