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      Scientific American January 31, 1891

      Experimental Science- January 31, 1891

      • By Geo. M. Hopkins on January 31, 1891

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      More in the January 31, 1891 issue of Scientific American
      • An Improved Tappet
      • Index of Inventions- January 31, 1891
      • Recently Patented Inventions- January 31, 1891
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