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