Interested persons other than the petitioner shall have a reasonable opportunity as specified by the Board in particular cases to submit to the Board written data, views, or arguments relating to the petition. Such matter should be filed with the Administrative Review Board, U.S. Department of Labor, in accordance with 29 CFR part 26 . Copies of any such matter shall be served on the petitioner and other interested persons.
29 C.F.R. §7.7