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      Knowledge is Power

      Scientific American June 03, 1916

      “Pupinized” Telephone Lines

      An Invention by Means of Which Telephone Conversations can be Carried on Over Long1 Distances

      • By Francis B. Crocker on June 3, 1916

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      More in the June 03, 1916 issue of Scientific American
      • Aviation Sickness, Its Symptoms and Cure
      • Radiations from Atoms and Electrons—V
      • The Development of the Military Aeroplane
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