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      Knowledge is Power

      Scientific American June 29, 1918

      Extensions in Patent and Trade Mark Cases

      • By E. B. Marshall on June 29, 1918

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      More in the June 29, 1918 issue of Scientific American
      • Inventions New and Interesting- June 29, 1918
      • The War Activities of Our Technical Societies
      • Ergotism
      View Full Contents
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