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