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      Scientific American August 30, 1919

      Modern Machine Design in Old China, Ventilation of the Vehicular Tunnel, and more

      • August 30, 1919

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      More in the August 30, 1919 issue of Scientific American
      • Recently Patented Inventions - August 30, 1919
      • The James Watt Centenary
      • Inventions New and Interesting - August 30, 1919
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