In accordance with the present invention there are also provided {HEAD ~ hinge means} between the base frame and {TAIL ~ operating leaf frame} 
between
In accordance with the present invention there are also provided { HEAD ~ hinge means } between the base frame and { TAIL ~ operating leaf frame }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL