an electric motor for applying an electric steering assist to {HEAD ~ a steering system} of {TAIL ~ the vehicle} 
of
an electric motor for applying an electric steering assist to { HEAD ~ a steering system } of { TAIL ~ the vehicle }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL