31 - Patented materials or articles.

§ 31. Patented materials or articles. In the improvement, maintenance,  or  repair  of  the canal system, no patented material or article or any  other material  or  article  shall  be  specified,  contracted  for,  or  purchased,  except  under  such circumstances that there can be fair and  reasonable opportunity for competition, the conditions to secure  which,  shall be prescribed by the corporation.