A fibrous filter element for trapping diesel engine exhaust particulates comprises a mass of coiled wire of {HEAD ~ flattened cross section} compacted into {TAIL ~ a small passage gas pervious body} 
compacted into
A fibrous filter element for trapping diesel engine exhaust particulates comprises a mass of coiled wire of { HEAD ~ flattened cross section } compacted into { TAIL ~ a small passage gas pervious body }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL