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