A scanner 18 wherein {HEAD ~ the scanner} has {TAIL ~ a roller transport} for positioning articles to be scanned 
has
A scanner 18 wherein { HEAD ~ the scanner } has { TAIL ~ a roller transport } for positioning articles to be scanned
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH