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      Knowledge is Power

      Scientific American October 02, 1920

      Seventy-Five Years of Invention

      A Record of Progress, Decade by Decade

      • October 2, 1920

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      More in the October 02, 1920 issue of Scientific American
      • Recently Patented Inventions - October 2, 1920
      • The Future as Suggested by Developments of the Past Seventy-five Years, Civil Engineering and more
      • Seventy-Five Years of American Patent Administration
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