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      Knowledge is Power

      Scientific American September 04, 1920

      The Third Degree for the Baseball

      • By Edgar Lockhart on September 4, 1920

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      More in the September 04, 1920 issue of Scientific American
      • Inventions New and Interesting - September 4, 1920
      • Recently Patented Inventions - September 4, 1920
      • A Forward Step in American Airplane Engines, This Year's Nominations for the Hall of Fame
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