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      Scientific American March 09, 1912

      What Inventors are Doing

      Simple Patent Law; Patent Office News; Inventions New and Interesting

      • March 9, 1912

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      More in the March 09, 1912 issue of Scientific American
      • Four-dimensional Space
      • Recently Patented Inventions - March 9, 1912
      • A Mechanical Violin Player
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