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      Knowledge is Power

      Scientific American May 20, 1882

      Gold and Its Manufactures

      Watch Cases, Their Uses, Materials, and Qualities

      • May 20, 1882

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      More in the May 20, 1882 issue of Scientific American
      • Centrifugal Ship's Pump
      • Explosion of Two Steam-Boilers at Jewell's Mill, Brooklyn, N. Y
      • Mexican Caves With Human Remains
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