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