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      Knowledge is Power

      Scientific American July 24, 1920

      Inventions New and Interesting - July 24, 1920

      A Department Devoted to Pioneer Work in the Arts

      • July 24, 1920

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      More in the July 24, 1920 issue of Scientific American
      • Descendants of the Water-Wheel
      • Recently Patented Inventions - July 24, 1920
      • Fifteen Thousand Photographs per Second
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