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      Scientific American September 03, 1921

      From Swords to Plowshares

      A Survey of the Post-War Activities of the Huge Krupp Works

      • September 3, 1921

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      More in the September 03, 1921 issue of Scientific American
      • Our "ZR-2" Airship and its Shed
      • Correspondence
      • Recently Patented Inventions
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