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When Paperwork Goes Wrong: The Engineer Who Never Invented What Made Him Rich

When Paperwork Goes Wrong: The Engineer Who Never Invented What Made Him Rich

A simple filing error at the U.S. Patent Office turned a struggling engineer's modest water pump improvement into a lifetime of royalties from an invention he'd never seen. For decades, Harold Zimmerman collected checks for a device that revolutionized American kitchens — despite having no idea how it actually worked.