Every China Trade Act corporation shall maintain in the District of Columbia a person as its accredited agent, upon whom legal process may be served, in any suit to be brought in the United States District Court for the District of Columbia, and who is authorized to enter an appearance in its behalf. In the event of the death or inability to serve, or the resignation or removal, of such person, such corporation shall, within such time as the Secretary by regulation prescribes, appoint a successor. Such corporation shall file with the Secretary a certified copy of each power of attorney appointing a person under this section, and a certified copy of the written consent of each person so appointed.