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      Scientific American November 1925

      An Invisible Police Alarm

      Radio Is Proving Its Usefulness in the Form of a Powerful Weapon Against Criminals

      • By Orrin E. Dunlap Jr. on November 1, 1925

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      More in the November 1925 issue of Scientific American
      • Every Crime is Entrenched Behind a Lie
      • Linking Mexico and California
      • Science and Money, November 1925
      View Full Contents
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