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      Knowledge is Power

      Scientific American September 24, 1921

      Glass Tubes by Machine

      How Handwork has Been Eliminated From a Task Formerly Done Altogether by Hand

      • September 24, 1921

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      More in the September 24, 1921 issue of Scientific American
      • Is Airship Travel Profitable?, The Divining Rod and more
      • A. Bridge Building Record
      • Keeping the Railroads Afloat
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