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      Knowledge is Power

      Scientific American September 22, 1917

      Recently Patented Inventions- September 22, 1917

      • September 22, 1917

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      More in the September 22, 1917 issue of Scientific American
      • The Absent Treatment in Efficiency Tests
      • Astronomy- September 22, 1917
      • Industrial Efficiency- September 22, 1917
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