A disk for identifying individual symbols on a reel displayed in a symbol display region of a mechanical slot machine, the disk being concentric with the rotational axis of the reel and rotatable along with the reel, the disk surface being provided with a plurality of convex members protruding radially around the rotational axis, and the plurality of convex members each having at the top a detection surface whose distance from the rotational axis is within a unique range.

 
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< Child motion device

> Gaming device having free potential winning combinations

> Advertising/promotional display and gift delivery system

~ 00553