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      Scientific American July 09, 1921

      Recently Patented Inventions

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

      • July 9, 1921

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      More in the July 09, 1921 issue of Scientific American
      • A Chat with Madame Curie
      • Electricity, Science, Aeronautics
      • A Giant Junk Yard
      View Full Contents
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