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