409 A.2d 1207 Rochester Pittsburgh Coal Co. and Old Republic Companies, Petitioners v. Commonwealth of Pennsylvania, Workmen’s Compensation Appeal Board, Raymond Schwab and Commonwealth of Pennsylvania, Department of Labor and Industry, Respondents. Commonwealth Court of Pennsylvania.Argued December 6, 1979 January 17, 1980. Workmen’s compensation — Pneumoconiosis — Burden of proof — Date when total disability […]