{HEAD ~ The force} necessary to rotate the elongated tubular member 30 and {TAIL ~ thus electrode} 42 is provided by an electric motor 68 disposed within framework 37 
necessary to rotate
{ HEAD ~ The force } necessary to rotate the elongated tubular member 30 and { TAIL ~ thus electrode } 42 is provided by an electric motor 68 disposed within framework 37
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH