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      Scientific American July 20, 1907

      The Saint-Michel Station of the Paris Metropolitan

      Building a Tube Under-the Seine

      • July 20, 1907

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      More in the July 20, 1907 issue of Scientific American
      • A Self-Propelling Searchlight
      • Preparation of a Moth-Exterminating Powder
      • Autogenous Welding of Metals
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