In addition, the caked grain can be crushed and discharged through the guide hole by gravity flow without the necessity for {HEAD ~ an operator} to enter {TAIL ~ the silo} 
In addition , the caked grain can be crushed and discharged through the guide hole by gravity flow without the necessity for { HEAD ~ an operator } to enter { TAIL ~ the silo }
OTH OTH OTH 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 REL REL TAIL TAIL TAIL TAIL TAIL TAIL