Historic artifact for a holiday weekend

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This is the world's first frozen margarita machine, invented and built by Mariano Martinez in 1971 from parts of a soft-serve ice cream maker. His inspiration: A 7-11 Slurpee.

Today, it resides in the collection of the National Museum of American History, where a museum director once called it a, "classic example of the American entrepreneurial spirit."

Smithsonian: Top 10 Inventions from the Collections of the National Museum of American History

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