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      Scientific American September 03, 1921

      Recently Patented Inventions

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

      • September 3, 1921

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      More in the September 03, 1921 issue of Scientific American
      • Our "ZR-2" Airship and its Shed
      • Correspondence
      • Cultivated Rubber
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