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      Digital & 4-Year Archive

      Scientific American April 20, 1872

      Frictional Gearing - April 20, 1872

      • By E. S. Wicklin on April 20, 1872

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      More in the April 20, 1872 issue of Scientific American
      • Beet Sugar in the United States
      • Notes and Queries - April 20, 1872
      • The Advance in the Price of Iron
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