{HEAD ~ The powder mixture} according to {TAIL ~ the invention} is characterized in that it is practically free of phosphorous and thus only contains phosphorous as an impurity  
{ HEAD ~ The powder mixture } according to { TAIL ~ the invention } is characterized in that it is practically free of phosphorous and thus only contains phosphorous as an impurity
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH