Further, at least one embodiment provides {HEAD ~ an assist mechanism} that includes {TAIL ~ a pressing device}, a stopper mechanism, an engagement member, a catch portion, and a release member 
includes
Further , at least one embodiment provides { HEAD ~ an assist mechanism } that includes { TAIL ~ a pressing device } , a stopper mechanism , an engagement member , a catch portion , and a release member
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH