On and after January 1, 1974, any claim for benefits for death or total disability due to pneumoconiosis shall be filed pursuant to the applicable State workmen’s compensation law, except that during any period when miners or their surviving widows, children, parents, brothers, or sisters, as the case may be, are not covered by a State workmen’s compensation law which provides adequate coverage for pneumoconiosis, and in any case in which benefits based upon eligibility under paragraph (5) of section 921(c) of this title are involved.[1] they shall be entitled to claim benefits under this part.
Final regulations required for implementation of any amendments to this part shall be promulgated and published in the Federal Register at the earliest practicable date after the date of enactment of such amendments, and in no event later than the end of the sixth month following the month in which such amendments are enacted.