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They appeared on mechanical slot machines manufactured by Mills Novelty Co. as early as the mid 1920s. The change cannot be done instantaneously, but only after the selected machine has been idle for at least four minutes. After the change is made, the machine must be locked to new players for four minutes and display an on-screen message informing potential players that a change is being made. Historically, all slot machines used revolving mechanical reels to display and determine results.