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      Knowledge is Power

      Scientific American April 05, 1913

      Pioneers in Telephone Engineering

      Experiences with the First Telephones

      • By Thomas A. Watson on April 5, 1913

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      More in the April 05, 1913 issue of Scientific American
      • Animals as Converters of Plant Nutriments into Human Foodstuffs
      • The House Fly: How it Spreads Disease
      • Cooling Towers for Industrial Establishments
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