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      Knowledge is Power

      Scientific American March 06, 1909

      The Internally-Fired Helical Furnace

      Wholesale Annealing and Hardening Done Almost Automatically

      • By C. M. Ripley on March 6, 1909

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      More in the March 06, 1909 issue of Scientific American
      • A Gasoline Caterpillar Traction Engine
      • Fenders and Wheelguards
      • Revising the Russian Calendar
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