A pair of {HEAD ~ rollers} 4 constituting {TAIL ~ one part} of a wave generator 3 and functioning as a cam are disposed to be rotatable within the flexible gear 2 
constituting
A pair of { HEAD ~ rollers } 4 constituting { TAIL ~ one part } of a wave generator 3 and functioning as a cam are disposed to be rotatable within the flexible gear 2
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL 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