{TAIL ~ Filter} for {HEAD ~ an X ray device}, and X ray device embodying such a filter 
{ TAIL ~ Filter } for { HEAD ~ an X ray device } , and X ray device embodying such a filter
TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH