; and inserting this disease or who were totally disabled by this disease at the time of their deaths; ; and (ii) by inserting or who were totally disabled by this disease at the time of their deaths after such disease ; and (B) in section 411(a) ( 30 U.S.C. 921(a) ), by striking , except and all that follows through of 1981, . (2) Effective Date The amendments made by paragraph (1) shall apply with respect to claims that are— (A) filed under part C of the Black Lung Benefits Act ( 30 U.S.C. 931 et seq. ) on or after the date that is 5 years before the date of date of enactment of this Act