(a) Filing. All papers submitted to the Board under this part shall be filed with the Clerk of the Appellate Boards, U.S. Department of Labor.

(b) Manner of service. Service under this part shall be in accordance with 29 CFR part 26. Service by mail is complete on mailing. For purposes of this part, filing is accomplished upon the day of service, by mail or otherwise.

(c) Proof of service. Papers filed with the Board shall contain an acknowledgement of service by the person served or proof of service in the form of a statement of the date and the manner of service and the names of the person or persons served, certified by the person who made service.

(d) Service upon the Department of Labor and other interested parties. A copy of all documents filed with the Board shall be served upon the Associate Solicitor, Division of Fair Labor Standards, U.S. Department of Labor, Washington, DC 20210; the Administrator, Wage and Hour Division, U.S. Department of Labor, Washington, DC 20210; the Federal contracting agency involved; and all other interested parties.