Indexing overlay for computer display devices such as CRT's and plasma displays. The overlay consists of a sheet of hi-static vinyl, acetate or the like of a size to conveniently cover the display area of columns and rows of discrete displayable positions. The sheet is of a thickness so that the overlay...http://www.google.com/patents/US4559705?utm_source=gb-gplus-sharePatent US4559705 - Indexing overlay for video display devices
