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      Scientific American September 21, 1872

      Practical Hints to Inventors - September 21, 1872

      • September 21, 1872

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      More in the September 21, 1872 issue of Scientific American
      • Business and Personal - September 21, 1872
      • Gold Pen Making
      • Meeting of the British Association—Address by a New York Herald Reporter—Livingstone in Africa
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