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      Knowledge is Power

      Scientific American May 08, 1920

      Bringing the X-Ray to the Patient, Light-Filters for Observing Pilot Balloons

      • By Ralph Howard on May 8, 1920

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      More in the May 08, 1920 issue of Scientific American
      • The Heavens in May, 1920
      • A Telephone to Europe?
      • Inventions New and Interesting - May 8, 1920
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