A small synchronous motor with high reliability so devised that {HEAD ~ transition} from start operation to {TAIL ~ synchronous operation} is ensured 
to
A small synchronous motor with high reliability so devised that { HEAD ~ transition } from start operation to { TAIL ~ synchronous operation } is ensured
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH