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