An object of the invention is to provide {HEAD ~ a locking mechanism} which allows {TAIL ~ a cover} to be opened by one hand 
allows
An object of the invention is to provide { HEAD ~ a locking mechanism } which allows { TAIL ~ a cover } to be opened by one hand
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH