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For every innovation by the bandit-beaters, the operators develop a safeguard. And for every safeguard, there is a new way to hit the jackpot. "Hell," says one disgusted slot-machine mechanic, "you could surround the thing with sheet metal, and they will find a way to beat it." Yet for all the troubles with the professional jackpotters, there are always enough honest, ordinary suckers around to make the one-armed bandit history's healthiest highwayman.