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      Knowledge is Power

      Scientific American May 09, 1914

      The Development of Electrically Operated Tools

      Plate-bending Rolls and Hole-cutting Machines Designed at South Bethlehem

      • By Frank C. Perkins on May 9, 1914

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      More in the May 09, 1914 issue of Scientific American
      • Properties of Water and Ice at High Pressures—II
      • The Research Chemist and the Textile Industry
      • A School of Porpoises at the New York Aquarium
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