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