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