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      Scientific American February 20, 1915

      Stretchers of Straw for the Dutch Army, Phonograph and other Mechanical Aids for the Aviator, and more

      • By W. J. L. Kiehl on February 20, 1915

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      More in the February 20, 1915 issue of Scientific American
      • Notes and Queries - February 20, 1915
      • Recently Patented Inventions - February 20, 1915
      • The Sixth Award of the Scientific American Medal for Safety Devices
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