The articles of incorporation may be amended at any time, or from time to time, by the affirmative vote of two-thirds ( ²/₃ ) of the members present at any annual meeting of the stockholders, if notice of the proposed amendment shall have been given in the call for such meeting. Such amendments shall be put into effect by the directors, who shall sign and acknowledge and file, as above provided, new or revised articles containing such amendments and superseding the original articles.