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      Scientific American January 27, 1912

      Automatic Telephone Exchanǵe Systems—III

      A Survey of the Present State of the Art

      • By W. Aitken on January 27, 1912

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      More in the January 27, 1912 issue of Scientific American
      • Science Notes
      • The Properties of Selenium and their Applications in Electrotechnics—II
      • Incandescent Gas Mantles of Artificial Silk
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