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      Digital & 4-Year Archive

      Scientific American December 04, 1920

      The Flyer's Artificial Eye and Ear, Finding a Cool Hat

      • By Alfred Gradenwitz on December 4, 1920

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      More in the December 04, 1920 issue of Scientific American
      • Inventions New and Interesting
      • That Parallel Postulate
      • Items in Brief
      View Full Contents
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