At the same time, a ring gear 12 is formed by {HEAD ~ the molding} of {TAIL ~ the resin} 3 
of
At the same time , a ring gear 12 is formed by { HEAD ~ the molding } of { TAIL ~ the resin } 3
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH