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      Spring Flash Sale

      Scientific American May 10, 1919

      Inventions New and Interesting - May 10, 1919

      A Department Devoted to Pioneer Work in the Arts

      • May 10, 1919

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      More in the May 10, 1919 issue of Scientific American
      • Free as Air
      • Shale Oil as a Business Proposition
      • The Seagull Flies
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