{TAIL ~ The stopper mechanism} is configured to control and release {HEAD ~ opening} of the openably closable unit 
{ TAIL ~ The stopper mechanism } is configured to control and release { HEAD ~ opening } of the openably closable unit
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH