A number of years ago, I stumbled across an old pie tin at a flea market. It was a pretty standard affair with a plain rim and a few small holes punched through the bottom to keep the crust crispy. I'm not much of a baker, but I was fascinated by the familiar name embossed on the bottom: Frisbie's Pies. So I forked over $5, hoping to own a piece of intellectual-property history.

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