{TAIL ~ control means} for controlling {HEAD ~ the speed} of the electric motor to thereby control the rotating speed of the tubular member 
{ TAIL ~ control means } for controlling { HEAD ~ the speed } of the electric motor to thereby control the rotating speed of the tubular member
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH