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      Scientific American March 04, 1911

      The Largest Electric Valve in the World

      • By Frank C. Perkin on March 4, 1911

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      More in the March 04, 1911 issue of Scientific American
      • Case for Phonograph Records
      • Rawhide Hammer, Cone Center Dividers, and more
      • The Bleriot "Bus"
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