Gaming apparatus has rotatable disks turning about a common axis of rotation and having annular bands of indicia of different diameters on faces of the disks which extend toward the axis of rotation. A player's winnings are determined by alignment of particular indicia along one or more radii of the...http://www.google.co.uk/patents/US6105962?utm_source=gb-gplus-sharePatent US6105962 - Rotating disks slot machine
