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      Knowledge is Power

      Scientific American September 12, 1903

      More Information about the Prize for a Dust-Arresting Respirator

      • September 12, 1903

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      More in the September 12, 1903 issue of Scientific American
      • Another Great Hydraulic-Electric Power Plant
      • Index of Inventions - September 12, 1903
      • Photography in Colors--The Three Color Method
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