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      Knowledge is Power

      Scientific American April 08, 1893

      Simple Slide Changer and Eclipser

      • By Geo. M Hopkins on April 8, 1893

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      More in the April 08, 1893 issue of Scientific American
      • An Automatic Knife Grinder
      • Business and Personal - April 8, 1893
      • Improved Method of Stringing Pianos
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