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      Knowledge is Power

      Scientific American February 26, 1921

      A Phonograph that is Always at its Best, Power Transmission by Fluid Waves and more

      • By R. G. Skerrett on February 26, 1921

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      More in the February 26, 1921 issue of Scientific American
      • Latin Foods in Old New York
      • The Latest Japanese Battleship Nagato, Development of Germany's Inland Waterways and more
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