An assist mechanism aids {HEAD ~ movement} of {TAIL ~ a retractable unit} reciprocally moving between an open and a closed position and includes a pressing device, a stopper mechanism, an engagement member, a catch portion, and a release member 
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An assist mechanism aids { HEAD ~ movement } of { TAIL ~ a retractable unit } reciprocally moving between an open and a closed position and includes a pressing device , a stopper mechanism , an engagement member , a catch portion , and a release member
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH