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      Knowledge is Power

      Scientific American October 1923

      Behind the Underwriters' Label

      The Gruelling Tests Imposed by the Insurance Man Upon Materials and Appliances

      • By A. G. Ingalls on October 1, 1923

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      More in the October 1923 issue of Scientific American
      • A Traveling School for Railway Men, Standardization of Wood Screws
      • Electrical Notes, October 1923
      • Our Abrams Investigation--I.
      View Full Contents
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