Section 434. A final receipt, given by an employe or dependent entitled to compensation under a compensation agreement or award, shall be prima facie evidence of the termination of the employer's liability to pay compensation under such agreement or award: Provided, however, That the board, or a referee designated by the board, may, at any time within two years from the date to which payments have been made, set aside a final receipt, upon petition filed with the board, if it be conclusively proved that all disability due to the occupational disease in fact had not terminated. Where, however, a person is receiving benefits pursuant to the act of June 28, 1935 (P.L.477, No.193), referred to as the Heart and Lung Act, the two-year period within which the board or a referee designated by the board may set aside a final receipt upon petition filed with the board, shall not begin to run until the expiration of receipt of benefits under the Heart and Lung Act.
(434 amended Apr. 4, 1974, P.L.236, No.55)