A slot machine includes a rotatable reel which is cylindrical shaped. The reel is provided with a first display portion on a side surface and with a second display portion on a periphery. In performing a first game, the side surface is so perpendicular that the first display portion may be observable....http://www.google.co.uk/patents/US6715756?utm_source=gb-gplus-sharePatent US6715756 - Symbol display device for game machine
