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      Knowledge is Power

      Scientific American May 03, 1919

      Recently Patented Inventions - May 3, 1919

      Brief Descriptions of Recently Patented Mechanical and Electrical Devices, Tools, Farm implements, Etc

      • May 3, 1919

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      More in the May 03, 1919 issue of Scientific American
      • New Books, Etc. - May 3, 1919
      • The Invention that Won the War
      • America's Optical Emancipation
      View Full Contents
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