> > Door > > Gambling machines, like pinball machines, have a door. That door has a switch on it. > Among other things, the game typically uses it to indicate when to disable > high-voltage electromechanical parts so that people don't get fried.
In addition, many have additional locks and doors etc. to stop people accessing the insides and potentially stealing cash etc. as these things tend to be much more strictly regulated than other arcade games.
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