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      Knowledge is Power

      Scientific American May 24, 1919

      Cleaning Up After the Submarine War

      Bringing the Ships of Our Merchant Marine Back to Peace-Time Condition

      • May 24, 1919

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      More in the May 24, 1919 issue of Scientific American
      • Inventions New and Interesting - May 24, 1919
      • Recently Patented Inventions - May 24, 1919
      • A Megaphone of Novel Design
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