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      Knowledge is Power

      Scientific American February 28, 1920

      Inventions New and Interesting - February 28, 1920

      A Department Devoted to Pioneer Work in the Arts

      • February 28, 1920

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      More in the February 28, 1920 issue of Scientific American
      • Electron Tube Generator
      • Motor Bus vs. Street Car
      • What About Our Commercial Aviation?
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