an additive product in said chamber for adding to said container after {HEAD ~ at least part} of {TAIL ~ said membrane} is severed 
of
an additive product in said chamber for adding to said container after { HEAD ~ at least part } of { TAIL ~ said membrane } is severed
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH