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      Knowledge is Power

      Scientific American September 25, 1897

      Recently Patented Inventions - September 25, 1897

      • September 25, 1897

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      More in the September 25, 1897 issue of Scientific American
      • A Few New Inventions
      • Business and Personal - September 25, 1897
      • Leland O. Howard, Ph.D., Permanent Secretary American Association of Science
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