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      Knowledge is Power

      Scientific American April 04, 1891

      The Business end of the American Newspaper

      • By A. H. Siegfried on April 4, 1891

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      More in the April 04, 1891 issue of Scientific American
      • Electrical Police Apparatus
      • Peroxide of Hydrogen
      • The Curious History of a Ladybird - how it Saved the Orange Interests of California
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