The frame 20 is provided with a pair of {HEAD ~ transverse flanges} 51 which are adapted to overlie {TAIL ~ a pair} of flanges 52 which project from the plate 48 
are adapted to overlie
The frame 20 is provided with a pair of { HEAD ~ transverse flanges } 51 which are adapted to overlie { TAIL ~ a pair } of flanges 52 which project from the plate 48
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH