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      Memorial Day Sale

      Scientific American September 15, 1877

      Index of Inventions

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

      • September 15, 1877

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      More in the September 15, 1877 issue of Scientific American
      • Allen's Improved Fire Escape
      • Electrical Apparatus to Indicate Overstrain or Weakness in Bridges or Other Structures
      • Improved Method of Compressing Cotton
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