Still more particularly, it is directed to molded hardboard roofing shingles impregnated with {HEAD ~ a phosphorus} containing {TAIL ~ phenolic resin} 
containing
Still more particularly , it is directed to molded hardboard roofing shingles impregnated with { HEAD ~ a phosphorus } containing { TAIL ~ phenolic resin }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL