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