a data processing means connected to the source, the plurality of power control means and the temperature sensing {HEAD ~ means} for controlling the amount of {TAIL ~ heating} in accordance with a desired heating pattern 
a data processing means connected to the source , the plurality of power control means and the temperature sensing { HEAD ~ means } for controlling the amount of { TAIL ~ heating } in accordance with a desired heating pattern
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH