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      Knowledge is Power

      Scientific American March 1922

      Patents and Trade-Marks, March 1922

      General Principles, Current Comment, and Interesting Decisions

      • March 1, 1922

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      More in the March 1922 issue of Scientific American
      • A Recorder that Speaks, An X-ray Outfit in a Hand-Satchel
      • Electrical Notes, March 1922
      • Learning While Earning
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