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      Scientific American April 22, 1916

      Inventions New and Interesting - April 22, 1916

      Simple Patent Law; Patent Office News; Notes on Trademarks

      • April 22, 1916

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      More in the April 22, 1916 issue of Scientific American
      • Correspondence - April 22, 1916
      • New Books, Etc. - April 22, 1916
      • Wood Wastes—II
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