38 C.F.R. § 20.504 Rule 504. Notices sent to last addresses of record in simultaneously contested claims.
Title 38 - Pensions, Bonuses, and Veterans' Relief
Notices in simultaneously contested claims will be forwarded to the last address of record of the parties concerned and such action will constitute sufficient evidence of notice. (Authority: 38 U.S.C. 7105A(b))
Title 38: Pensions, Bonuses, and Veterans' Relief
PART 20—BOARD OF VETERANS' APPEALS: RULES OF PRACTICE
Subpart F—Simultaneously Contested Claims
§ 20.504 Rule 504. Notices sent to last addresses of record in simultaneously contested claims.

