The soot filter 1, wherein {TAIL ~ said contact part} is {HEAD ~ a one piece contact part} wound from a spring wire, and said contact part is wound, at least at said free end, so as to make gliding contact with said glow rod 
The soot filter 1 , wherein { TAIL ~ said contact part } is { HEAD ~ a one piece contact part } wound from a spring wire , and said contact part is wound , at least at said free end , so as to make gliding contact with said glow rod
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH