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