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      Scientific American October 30, 1915

      Aerial Range-Finding with Electrical "Ears"

      A Microphone System of Detecting Invisible Airships and Determining Ranges

      • October 30, 1915

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      More in the October 30, 1915 issue of Scientific American
      • Correspondence - October 30, 1915
      • Tennis as Compared to Golf
      • The Great Gas Tunnel Under the East River
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