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      Celebrate Math Awareness Month

      Scientific American May 10, 1919

      The Selling of Patent Rights

      Methods by Which an Inventor May Obtain Satisfactory Returns from His Patent

      • By Ford W. Harris

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      More in the May 10, 1919 issue of Scientific American
      • Keeping the Propeller Dry
      • The Magnetic Field of the Sun
      • Manganese alloys in Open-Hearth Steel Practice
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