{HEAD ~ The trays} are mounted on {TAIL ~ a generally cylindrical carousel} which is rotated about its axis to bring successive ones of the trays into position for loading wafers on to the trays and unloading wafers from the trays 
{ HEAD ~ The trays } are mounted on { TAIL ~ a generally cylindrical carousel } which is rotated about its axis to bring successive ones of the trays into position for loading wafers on to the trays and unloading wafers from the trays
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL 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