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      Scientific American January 1923

      On the Trail of the Taxi Driver, The Flickerless Projector

      • By Alfred Gradenwitz, Gilbert I. Stodola on January 1, 1923

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      More in the January 1923 issue of Scientific American
      • Airplanes in the Public Consciousness
      • Civil Engineering Notes, January 1923
      • Leaves from the Archaeologist's Note-Book
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