means operatively connected to said heating elements and said control means for supplying {HEAD ~ power} to said {TAIL ~ heating elements} 
to
means operatively connected to said heating elements and said control means for supplying { HEAD ~ power } to said { TAIL ~ heating elements }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH TAIL TAIL TAIL TAIL TAIL TAIL