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      Scientific American May 14, 1921

      Keeping Our Railroads Up to the Mark

      Pneumatic Apparatus That Constitutes the Prime Factor in Trunk-Line Maintenance of Way

      • By Robert G. Skerrett on May 14, 1921

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      More in the May 14, 1921 issue of Scientific American
      • Correspondence
      • Motorizing the Rural Church
      • Farming with Electricity
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