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      Knowledge is Power

      Scientific American December 13, 1919

      Again the Helicopter?

      Experiments by Prominent Inventors Who Hope to Realize This Long-Standing Dream

      • By Robert G. Skerrett on December 13, 1919

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      More in the December 13, 1919 issue of Scientific American
      • Post-Bellum Britain and the Inventor
      • Recently Patented Inventions - December 13, 1919
      • Signposts of the Sea
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