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      Scientific American July 23, 1921

      Reporting the Life Story of Rails

      How Railroads Employ the Rail-Section Machine for Determining the Wear and Tear on Their Tracks

      • By Robert G. Skerrett on July 23, 1921

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      More in the July 23, 1921 issue of Scientific American
      • Inventions New and Interesting - July 23, 1921
      • The Temple Driver--a Powder Gun which has no Recoil, Concussion or Flash
      • Molybdenum Steel in the Motor Car
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