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