{HEAD ~ The apparatus} 3 wherein {TAIL ~ said inner sidewall} extends from a region above said conveyor past an outer edge of said conveyor to a region below said conveyor, and said second airlock means comprises a bottom wall extending beneath said conveyor and connecting with said outer wall 
wherein
{ HEAD ~ The apparatus } 3 wherein { TAIL ~ said inner sidewall } extends from a region above said conveyor past an outer edge of said conveyor to a region below said conveyor , and said second airlock means comprises a bottom wall extending beneath said conveyor and connecting with said outer wall
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH