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      Celebrate Math Awareness Month

      Scientific American July 29, 1882

      Index of Inventions - July 29, 1882

      Letters Patent of the United States were Granted in the Week Ending

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      More in the July 29, 1882 issue of Scientific American
      • A New and Important Field for Research
      • Engineering Inventions - July 29, 1882
      • Microscopical Examination of Ice
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