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