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