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      Knowledge is Power

      Scientific American March 08, 1919

      The Hydrophone for Locating Submarines

      An Ingenious French Invention That Did Much to Make the Seas Safe for the Allies

      • March 8, 1919

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      More in the March 08, 1919 issue of Scientific American
      • Daylight Saving and the Farmer, The Declining Supply of Motor Fuel and more
      • Reconstruction in Europe--IV
      • The Work of the French Seaplanes
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