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      Knowledge is Power

      Scientific American June 21, 1919

      The American Precision Block

      An Industrial and Scientific By-Product of the War

      • June 21, 1919

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      More in the June 21, 1919 issue of Scientific American
      • Always On Its Toes, Think Nationally and more
      • Recently Patented Inventions - June 21, 1919
      • The Non-Stop Trans-Atlantic Flight
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