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      Knowledge is Power

      Scientific American January 09, 1886

      Of the Theory of the Electro-Magnetic Telephone Transmitter

      • By M. E. Mercadier on January 9, 1886

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      More in the January 09, 1886 issue of Scientific American
      • Patents - January 9, 1886
      • A New Condensation Hygrometer
      • Disruptive Discharges through Solids and Liquids
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