An apparatus 4, further comprising {HEAD ~ means} for hermetically sealing {TAIL ~ said recess} 
for hermetically sealing
An apparatus 4 , further comprising { HEAD ~ means } for hermetically sealing { TAIL ~ said recess }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL