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      Knowledge is Power

      Scientific American April 02, 1881

      The Telephonic Systems of Dr. Cornelius Herz

      • By Count du Moncel on April 2, 1881

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      More in the April 02, 1881 issue of Scientific American
      • Improvements in Gas Engines
      • On Radiophony
      • The “Brush” System of Electric Lighting
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