TITLE 20--EMPLOYEES' BENEFITS CHAPTER III--SOCIAL SECURITY ADMINISTRATION PART 410_FEDERAL COAL MINE HEALTH AND SAFETY ACT OF 1969, TITLE IV_BLACK LUNG BENEFITS (1969 )--Table of Contents Subpart F_Determinations of Disability, Other Determinations, Administrative Review, Finality of Decisions, and Representation of Parties Sec. 410.633 Additional parties to the hearing. The following individuals, in addition to those named in Sec. 410.632, may also be parties to the hearing. A widow, child, parent, brother, sister, or representative of a decedent's estate, who makes a showing in writing that such individual's rights with respect to benefits may be prejudiced by any decision that may be made, may be a party to the hearing. [37 FR 20652, Sept. 30, 1972]