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      Scientific American October 30, 1920

      Hardening Steel in Gas Fired Furnaces

      Some Interesting Details of One of the Leading Modern Heat-Treating Processes

      • By W. A. Ehlers on October 30, 1920

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      More in the October 30, 1920 issue of Scientific American
      • Do Moths use "Wireless"?
      • Revising High Bridge
      • The True Role of Water Power, Repairing the Propeller of a Destroyer and more
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