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      Scientific American April 30, 1870

      Improved Stall Floor for Horses, To Prevent Decay of Shingles, and more

      • April 30, 1870

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      More in the April 30, 1870 issue of Scientific American
      • Business and Personal- April 30, 1870
      • Morin's Experiments upon the Punching of Metals
      • Scientific Intelligence- April 30, 1870
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