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      Knowledge is Power

      Scientific American April 30, 1921

      With the Engineers of Industry

      A Department Devoted to the Physical Problems of the Plant Executive

      • April 30, 1921

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      More in the April 30, 1921 issue of Scientific American
      • Correspondence
      • Recruits for the World's Biggest Fish Show
      • Dyspepsia After Six Months
      View Full Contents
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