In {TAIL ~ a hot knife assembly} having a cylindrical tube surrounding a resistance heater for heating {HEAD ~ the knife} the improvement comprising: 
In { TAIL ~ a hot knife assembly } having a cylindrical tube surrounding a resistance heater for heating { HEAD ~ the knife } the improvement comprising :
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH