The “Jeopardy”-style answer is: The pop-up camper, the shopping cart, and the wheelchair brake system. The question: What are common products that were first introduced at the Minnesota Inventors Congress? For 50 years inventors from across the country have been flocking to Redwood Falls, Minn., to display their wares at the MIC, the world's oldest invention convention. “It gives inventors a place to test-market their products,” says Deb Hess, executive director of the nonprofit ...

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