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      Knowledge is Power

      Scientific American July 31, 1886

      Notes and Queries - July 31, 1886

      Hints to Correspondents

      • July 31, 1886

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      More in the July 31, 1886 issue of Scientific American
      • Business and Personal - July 31, 1886
      • Driving Apparatus
      • Index of Inventions - July 31, 1886
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