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