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      Scientific American July 25, 1914

      A Perpetual Electric Current, Wilkes Land Up to Date, and more

      • July 25, 1914

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      More in the July 25, 1914 issue of Scientific American
      • Did Prof. S. P. Langley Invent the First Practical Flying Machine?
      • Steering Air Craft at Sea
      • The Motor-driven Commercial Vehicle- July 25, 1914
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