75261570
Mar 21, 1997
Oct 30, 2001
passive light transfer devices for transferring and amplifying visual images for display on a screen for use in arenas, stadia, airports, billboards, transportation centers, educational facilities, golf courses, trade centers, hotels, race tracks, sports facilities, concert halls, amusement parks, shopping centers, museums, ski areas, closed circuit events, seaport terminals, conventions, and outdoor locations
Electrical and Scientific Apparatus