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      Knowledge is Power

      Scientific American December 1925

      A Machine that is More than Human

      An Amazing Electro-mechanical Device Which Distinguishes Between Thirty Different Shades

      • By Albert A. Hopkins on December 1, 1925

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      More in the December 1925 issue of Scientific American
      • Does a Radio "Roof" Top the World?
      • Man is what he Eats
      • Radio Notes, December 1925
      View Full Contents
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