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      Scientific American April 04, 1891

      Experimental Science- April 4, 1891

      • By Geo. M. Hopkins on April 4, 1891

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      More in the April 04, 1891 issue of Scientific American
      • A Tool Holder for Lathes, Planers, Etc.
      • Fireproof Partition Walls
      • Original Work in America
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