The present invention provides {HEAD ~ a device} for cleaning {TAIL ~ a screen} in a material processing apparatus wherein the screen has at least a plurality of elongate bars defining spaces therebetween through which material flows 
for cleaning
The present invention provides { HEAD ~ a device } for cleaning { TAIL ~ a screen } in a material processing apparatus wherein the screen has at least a plurality of elongate bars defining spaces therebetween through which material flows
OTH OTH OTH OTH 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 OTH OTH OTH OTH