week in history
本文作者： 21ST
Nov 20, 1866: The rotary-crank (回行曲柄) bicycle was patented by Frenchman Pierre Lallement. It was the first really popular design. But it earned the name of “bone-shaker” because of its rigid (不灵活的) frame and wheels that resulted in a “bone-shaking experience for riders”. |  |
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