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      Knowledge is Power

      Scientific American September 1926

      A Distinctly New Rectifier

      A Dry Metal Oxide Between Two Electrodes Makes a Rectifier that Presents a Wide Field for Interesting Experimental Work

      • By H. H. Sheldon on September 1, 1926

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      More in the September 1926 issue of Scientific American
      • A Zeppelin Express Cruiser
      • Fingerprints as Identification Marks in Ancient Greece-a Brief for Early Trade-marks
      • In the Editor's Mail, September 1926
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