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      Knowledge is Power

      Scientific American September 17, 1921

      Recently Patented Inventions

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

      • September 17, 1921

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      More in the September 17, 1921 issue of Scientific American
      • A New Profession
      • Fish Stories that are Stranger than Fiction
      • When Electricity Fires the Enamel Ware
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