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      Knowledge is Power

      Scientific American March 11, 1911

      Improvised Disk Talking Machine

      • By C. G. Kiplinger on March 11, 1911

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      More in the March 11, 1911 issue of Scientific American
      • Old Battleships as Permanent Forts
      • Science in the Current Periodicals- March 11, 1911
      • The Inventor's Department- March 11, 1911
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