{HEAD ~ A user controlled ornamental panel} or window, which is useful for {TAIL ~ a number} of applications in which the degree or amount of light passing through the panel is to be controlled 
is useful for
{ HEAD ~ A user controlled ornamental panel } or window , which is useful for { TAIL ~ a number } of applications in which the degree or amount of light passing through the panel is to be controlled
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH