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      Scientific American May 04, 1872

      A Suggestion to Inventors and Value of Patented Improvements upon Patented Inventions

      • May 4, 1872

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      More in the May 04, 1872 issue of Scientific American
      • Correspondence - May 4, 1872
      • New Books and Publications - May 4, 1872
      • Society of Arts of the Massachusetts Institute of Technology
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