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      Memorial Day Sale

      Scientific American May 20, 1911

      Rules Governing the Competition for the $15,000 Flying Machine Prize Offered by Mr. Edwin Gould

      • May 20, 1911

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      More in the May 20, 1911 issue of Scientific American
      • Diesel Marine Engines
      • Something about Writing Inks
      • Fire and Burglar-Proof Safes—II
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