In FIG 1 is shown {TAIL ~ a wave gear drive} comprising an inner gear having a given number of external teeth and an outer gear having a slightly larger number of {HEAD ~ internal teeth} 
In FIG 1 is shown { TAIL ~ a wave gear drive } comprising an inner gear having a given number of external teeth and an outer gear having a slightly larger number of { HEAD ~ internal teeth }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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