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      Knowledge is Power

      Scientific American May 25, 1878

      Patents - May 25, 1878

      Caveats, Copyrights, Trade Marks, Etc.

      • May 25, 1878

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      More in the May 25, 1878 issue of Scientific American
      • Communications
      • Improved Spring Bed
      • Notes and Queries - May 25, 1878
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