U.S. Commerce Dept. @CommerceGov
In the 1880s, Samuel Leeds Allen reinvented winter with the Flexible Flyer, a sled on red steel runners that riders could steer with their hands or feet. Learn more about his story in @USPTO's #JourneysofInnnovation series: https://t.co/abms4noVda https://t.co/zqcrrFFBCJ — PolitiTweet.org