A wave gear drive comprises a rigid gear, a flexible gear engaging at a plurality of bulged regions thereof with the rigid gear, and {HEAD ~ a wave generator} for causing {TAIL ~ the flexible gear} to perform wave motion 
for causing
A wave gear drive comprises a rigid gear , a flexible gear engaging at a plurality of bulged regions thereof with the rigid gear , and { HEAD ~ a wave generator } for causing { TAIL ~ the flexible gear } to perform wave motion
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH