{HEAD ~ The fixing} of the stirrer blades 15 on the rotation axle 16 is improved by {TAIL ~ a fixing piece} 17 
is improved by
{ HEAD ~ The fixing } of the stirrer blades 15 on the rotation axle 16 is improved by { TAIL ~ a fixing piece } 17
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH