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      Scientific American November 27, 1920

      Recently Patented Inventions

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

      • November 27, 1920

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      More in the November 27, 1920 issue of Scientific American
      • In the Modern Sawmill
      • New Books, Etc.
      • Tuning and Testing
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