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      Scientific American June 25, 1904

      The Telefunken Ondometer for the Measurement of Wireless Telegraphy Waves

      By Our Brussels Correspondent

      • June 25, 1904

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      More in the June 25, 1904 issue of Scientific American
      • Preliminary Report on an Archeological Trip to the West Indies
      • Advantages of Gas and Oil Engines for Marine Propulsion
      • Reducing the Candle-Power of Gas
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