An airbag is stored in a folded state in the airbag housing so that {HEAD ~ the weakened portion} is broken upon {TAIL ~ inflation} 
is broken upon
An airbag is stored in a folded state in the airbag housing so that { HEAD ~ the weakened portion } is broken upon { TAIL ~ inflation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL