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