The soot filter 1, wherein said contact part is {HEAD ~ a one piece contact part} wound from {TAIL ~ 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 
wound from
The soot filter 1 , wherein said contact part is { HEAD ~ a one piece contact part } wound from { TAIL ~ 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
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