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    • Root-pruning Container 

      Whitcomb, Carl E.; Board of Regents for the Oklahoma Agricultural & Mechanical Colleges acting for Oklahoma State University (U.S. Patent and Trademark Office, 1984-04-17)
      A root-pruning container involving a series of vertical pyramid like staircase stepped surfaces essentially parallel to the sidewall of said container and displaced to the inside of said container, wherein the vertical and ...