An information display apparatus having a plurality of rotatable elements to create a changeable display of information is described. The display apparatus comprises a frame 1 in which are mounted a plurality of rotatable disc-shaped elements 4, each element having two display surfaces 5 and 6 and an...http://www.google.com.au/patents/US4926167?utm_source=gb-gplus-sharePatent US4926167 - Information display apparatus
