Word: conductiv
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...machines just below the coin slot; coins that were either too hard or too soft bounced off the anvil into slots leading to the coin-return chute. When cheaters dis covered slugs with just the right bouncing qualities, Leverone's engineers countered with electrical devices to test conductiv ity, gauges to measure dimensions, gadg ets to bite for traces of lead or tin. But for years, as fast as Leverone improved his machines, ingenious customers found ways to cheat them, including ""tapping"," i.e., tilting the machine and whacking...
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