{HEAD ~ a rupturable membrane} sealed to {TAIL ~ said annular surface} by a continuous seal around said opening, said continuous seal being located on said annular surface 
sealed to
{ HEAD ~ a rupturable membrane } sealed to { TAIL ~ said annular surface } by a continuous seal around said opening , said continuous seal being located on said annular surface
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH