W hen he was young, Michael Henninger looked forward to spring as eagerly as some children look forward to their birthdays. Spring meant it was time to prepare Kennywood, his family’s amusement park just outside of Pitts- burgh, to open for the summer tourist season. “We could see the buildings go up, and the rides going back together,” says Henninger, whose great-grand- father, R.F. Henninger, helped estab- lish the park in 1898. “The excite- m

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