The headrest 3 illustrated is made of {HEAD ~ a metal plate channel} shaped in {TAIL ~ section} taken along the line III III in FIG 2 
shaped in
The headrest 3 illustrated is made of { HEAD ~ a metal plate channel } shaped in { TAIL ~ section } taken along the line III III in FIG 2
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH