* § 280. Cases not provided for in article. In any case not provided for in this article the rules of law and equity including the law merchant, and in particular the rules relating to the law of principal and agent, and the effect of fraud, misrepresentation, duress or coercion, mistake, bankruptcy or other invalidating cause shall govern. * NB Effective until April 4, 2020 * § 280. Supplementary provisions. Unless displaced by the provisions of this article, the principles of law and equity, including the law merchant and the law relating to principal and agent, estoppel, laches, fraud, misrepresentation, duress, coercion, mistake, insolvency, or other validating or invalidating cause, supplement its provisions. * NB Effective April 4, 2020