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      Scientific American April 1927

      Radio Notes, April 1927

      A Review and Commentary on the Progress in This Branch of Rapid Communication

      • By Orrin E. Dunlap Jr. on April 1, 1927

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      More in the April 1927 issue of Scientific American
      • Applied Science for the Amateur, April 1927
      • Fishes that Can Shock You
      • Inventors Who Have Achieved Commercial Success, April 1927
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