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      Scientific American September 1928

      Drafting Aids

      Tools Designed to Speed the Engineer's Work

      • September 1, 1928

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      More in the September 1928 issue of Scientific American
      • A Net of Weather Stations, The Bellanca Sesquiplane and more
      • Naval Adequacy--I
      • Tennis Ball Re-Napper, Portable Motor-Driven Air Pump and more
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