{HEAD ~ A pair} of {TAIL ~ spaced apart radio frequency shielding continuous screens} span each window opening and are supported by the window unit frame 
of
{ HEAD ~ A pair } of { TAIL ~ spaced apart radio frequency shielding continuous screens } span each window opening and are supported by the window unit frame
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH