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