slot in mechanical
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Steppers are commonly three-reel mechanical slot machines, so the traditional image of one is that three-reel mechanical slot.
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In the early days of slots, they’d traditionally have a single payline through the middle of the three reels ... Classic Mechanical Reel Slot Moves Online.
Slot machine - Wikipedia
Mechanical agitation in baffled vessels with turbines plays a vital role in achieving homogeneous fluid mixing and promoting various transfer operations.