Thus, no influence is exerted on rotation of {TAIL ~ the rotatable electrode means} by {HEAD ~ frictional force} caused by such a collector or brush 
Thus , no influence is exerted on rotation of { TAIL ~ the rotatable electrode means } by { HEAD ~ frictional force } caused by such a collector or brush
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH