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      Knowledge is Power

      Scientific American March 1928

      Outdoor Tractor Model Airplane, Golf-Ball Marking and more

      A Department Devoted to the Presentation of Useful Ideas. Material of Value to All Will Be Found Here

      • By A. P. Peck on March 1, 1928

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      More in the March 1928 issue of Scientific American
      • Analogous Arts, Trademarks in The Philippines and more
      • Evolution Reversed by Cornell Scientist, Sheet Steel Manufacture and more
      • New Discovery Speeds Up Evolution
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