By a majority vote of its directors, and the vote in meeting assembled of the holders of two-thirds of the outstanding stock, or, if the stock is divided into classes, by the vote of the holders of two-thirds of each class of outstanding stock, a corporation or association, organized under previously existing statutes, may be brought under the provisions of this subchapter by limiting its membership and adopting the other restrictions as provided herein. It shall make out in duplicate a statement signed and sworn to by a majority of its directors to the effect that the corporation or association, by a majority vote of the directors, and the vote in meeting assembled of the holders of two-thirds of the outstanding stock, or, if the stock is divided into classes, by the vote of the holders of two-thirds of each class of outstanding stock, has decided to accept the benefits and be bound by the provisions of this subchapter and has authorized all changes accordingly. Articles of incorporation shall be filed as required in section 995 of this title, except that they shall be signed by the members of the then board of directors. The filing fee shall be the same as for filing an amendment to the certificate of organization.