There is an entrance 11 on {HEAD ~ a surface} of the scanner housing structure 10 for feeding therefrom {TAIL ~ an article} to be scanned 
There is an entrance 11 on { HEAD ~ a surface } of the scanner housing structure 10 for feeding therefrom { TAIL ~ an article } to be scanned
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH