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      Knowledge is Power

      Scientific American May 22, 1920

      The Welded Joint in Structural-Steel Work

      • By Ralph Howard on May 22, 1920

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      More in the May 22, 1920 issue of Scientific American
      • Correspondence - May 22, 1920
      • Open-Air Mining of Coal by Electric Shovels
      • Dismantling a City
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