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      Scientific American January 17, 1920

      A Gaseous Earth and the Space it Would Occupy, Rebuilding Europe with the Tank-Derrick and more

      • January 17, 1920

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      More in the January 17, 1920 issue of Scientific American
      • Patent Office Facts
      • The Vacuum Tube--An Electrical Acrobat
      • Recently Patented Inventions - January 17, 1920
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