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      Knowledge is Power

      Scientific American January 18, 1919

      Getting More Messages Over Our Wires

      How the Traffic Capacity of Telegraph and Telephone Circuits Has Been Increased Three-fold

      • January 18, 1919

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      More in the January 18, 1919 issue of Scientific American
      • Battleship Strength of the Five Leading Naval Powers
      • The Service of the Chemist
      • Deterioration in Ultra-Violet Radiation of Mercury Lamps
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