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      Scientific American May 1930

      An Air-transport Operator Speaks

      "It Is the Operator's Obligation to Employ Every Known Device to Make Air Transport Safe and Speedy"

      • By P. G. Johnson on May 1, 1930

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      More in the May 1930 issue of Scientific American
      • Advice to Students of Aviation
      • Chemicals do not Fool Chickens
      • Michelson
      View Full Contents
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