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      Knowledge is Power

      Scientific American November 12, 1887

      An Improved Drill for Renewing Worn Out Valves and Valve Seats

      • November 12, 1887

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      More in the November 12, 1887 issue of Scientific American
      • How to Make a Camera Bellows
      • Notes and Queries - November 12, 1887
      • An Improved Railway Tie
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