Just a mention of the subject makes police chiefs turn purple and starts manufacturers pleading for secrecy. But there is no longer any hiding the fact that an epidemic of parking-meter jamming is sweeping the nation. Behind it are the flip-top cans now being used for beer and soft drinks. Each comes with a small pull-ring, which, when twisted free, is near enough to the size of a nickel to fit into a parking meter, either turning it on or jamming it.
Chicago reports that of the 108,628 slugs pumped into its 30,000 parking meters last month, 74,524 were flip-top...
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