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      Scientific American April 1916

      Inventions New and Interesting - April 1, 1916

      Simple Patent Law; Patent Office News; Notes on Trademarks

      • April 1, 1916

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      More in the April 1916 issue of Scientific American
      • Preparedness for Peace in the Mineral Industries - April 1, 1916
      • The Army Bills in Congress
      • Legal Notices - April 1, 1916
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