{HEAD ~ The soot filter} 1, wherein {TAIL ~ said contact part} is 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 
wherein
{ HEAD ~ The soot filter } 1 , wherein { TAIL ~ said contact part } is 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
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