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      Knowledge is Power

      Scientific American November 1922

      Inventions New and Interesting, November 1922

      A Department Devoted to Pioneer Work in the Various Arts and to Patent News

      • November 1, 1922

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      More in the November 1922 issue of Scientific American
      • Post-War Artillery
      • Science Notes, November 1922
      • The Musical Typewriter--A Device for Transposing and Recording Music
      View Full Contents
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