the reimbursement of operators and insurers for amounts paid by such operators and insurers (other than amounts paid as penalties, interest, or attorney fees) at any time in satisfaction (in whole or in part) of any claim denied (within the meaning of section 402(i) of the Black Lung Benefits Act) before
March 1, 1978, and which is or has been approved in accordance with the provisions of section 435
1
See References in Text note below.
of the Black Lung Benefits Act.