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      Knowledge is Power

      Scientific American April 07, 1888

      Some Experiments with an Electro-Magnet

      • By Geo. M Hopkins on April 7, 1888

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      More in the April 07, 1888 issue of Scientific American
      • An Improved Door Closer
      • An Improved Sleeve Stay
      • Engineering Inventions - April 7, 1888
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