The arm rest 4, wherein the locking element includes a latching element by which {TAIL ~ the guide rods} can be locked in discrete elevated positions in {HEAD ~ the guide channels} 
The arm rest 4 , wherein the locking element includes a latching element by which { TAIL ~ the guide rods } can be locked in discrete elevated positions in { HEAD ~ the guide channels }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD