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      Scientific American March 1923

      New Method of Salvage by Compressed Air

      A Submarine Tractor Makes Possible Lifting of Ships from Unprecedented Depths

      • March 1, 1923

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      More in the March 1923 issue of Scientific American
      • The Motor-Driven Commercial Vehicle, March 1923
      • When Electricity Magnifies the Speaker's Voice
      • Are Huge Aircraft Carriers Worth While?
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