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      Knowledge is Power

      Scientific American January 13, 1912

      "Holes in the Air" A Government Laboratory for Manufacturers

      • January 13, 1912

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      More in the January 13, 1912 issue of Scientific American
      • Curiosities of Science and Invention - January 13, 1912
      • The "Cement Gun"
      • Watching for and Preventing Forest Fires
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