First of all, the pressing roller unit or a plurality of {TAIL ~ such units} is located at the appropriate location or {HEAD ~ locations} 
First of all , the pressing roller unit or a plurality of { TAIL ~ such units } is located at the appropriate location or { HEAD ~ locations }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD