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      Knowledge is Power

      Scientific American October 17, 1891

      Six-Inch Five-Ton Hydro-Pneumatic Disappearing Gun

      • October 17, 1891

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      More in the October 17, 1891 issue of Scientific American
      • An Automatic Teapot
      • Improved Wire Mat and Indoor Wire Rugs, Stair Carpets, Etc.
      • Rope Bridges and their Military Applications
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