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      Knowledge is Power

      Scientific American April 24, 1909

      Animal Fats and Oils

      Some Manufacturing Processes

      • By W. H. Bentley on April 24, 1909

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      More in the April 24, 1909 issue of Scientific American
      • A New System of Welding
      • Definitions of Electrical Terms
      • Exploring the Great Wall of China
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