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      Knowledge is Power

      Scientific American June 26, 1915

      The Instrumental Study of the Heart

      Methods by Which its Action and Condition are Observed and Recorded

      • June 26, 1915

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      More in the June 26, 1915 issue of Scientific American
      • The Heavens in July
      • Electric Remote Gages for Shooting Ranges
      • The Naval and Military Exhibit of the National Security League
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