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A page from one of Lemelson’s invention notebooks, with an entry at the bottom of the page describing his idea for a new kind of propeller beanie that worked by blowing through a straw. There is a sketch of the beanie. The entry is dated 28 August 1950.

This page from one of Jerome Lemelson's invention notebooks shows his sketch for his first issued patent—a new kind of propeller beanie that didn't need wind. The wearer could blow into a tube to spin the propeller, or swap the propeller for a whistle. Courtesy of the Lemelson family

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