The exposed portion of {HEAD ~ the membrane} 24 is provided with {TAIL ~ a through hole} 30 
The exposed portion of { HEAD ~ the membrane } 24 is provided with { TAIL ~ a through hole } 30
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH