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      Scientific American May 19, 1906

      The Telephone System of the Future—The Semi-Automatic

      • By Le Roy W. Stanton on May 19, 1906

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      More in the May 19, 1906 issue of Scientific American
      • Locomotive Superheaters—Practical Difficulties in the use of Superheated Steam
      • Specific Heat of Superheated Steam
      • The Intensity of Pressure of Wheels on the Road
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