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      Knowledge is Power

      Scientific American May 18, 1889

      The Removal of Roof Water from Buildings

      • By Dwight Porter on May 18, 1889

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      More in the May 18, 1889 issue of Scientific American
      • A Simple Acid Pump
      • On Wool and Fur, modes of Cleansing them for the Textile Industry, and on a New Process Recently Patented by Messrs. Singer & Judell
      • The Phonopore
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