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      Knowledge is Power

      Scientific American July 20, 1918

      High Grade Electric Steel

      Pure Metal in Quantity by a New Process

      • July 20, 1918

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      More in the July 20, 1918 issue of Scientific American
      • Correspondence- July 20, 1918
      • The Motor-Driven Commercial Vehicle- July 20, 1918
      • The Salvage of Deeply Sunken Ships
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