Missouri Revised Statutes Title XL. Additional Executive Departments § 622.410. Service of division’s orders--notification of receipt of order--order effective, when

1. Every order of the division shall be served upon every person or corporation to be affected thereby, either by personal delivery of a certified copy thereof, or by mailing a certified copy thereof, in a sealed package with postage prepaid, to the person to be affected thereby, or, in the case of a corporation, to any officer or agent thereof upon whom a summons may be served in accordance with the provisions of the code of civil procedure.

2. It shall be the duty of every person and corporation to immediately notify the division, in writing, of the receipt of the certified copy of every order so served, and in the case of a corporation such notification must be signed and acknowledged by a person or officer duly authorized by the corporation to admit such service. Within a time specified in the order of the division every person and corporation upon whom it is served must if so required in the order notify the division in like manner whether the terms of the order are accepted and will be obeyed.

3. Every order or decision of the division shall of its own force take effect and become operative thirty days after the service thereof, except as otherwise provided, and shall continue in force either for a period which may be designated therein or until changed or abrogated by the division, unless such order be unauthorized by this law or any other law or be in violation of a provision of the Constitution of the State or of the United States.