{HEAD ~ A portable emergency vehicle battery charger} has {TAIL ~ a portable case}, a battery and a circuit board 
has
{ HEAD ~ A portable emergency vehicle battery charger } has { TAIL ~ a portable case } , a battery and a circuit board
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH