439 A.2d 841 Elizabeth B. Vavro, Widow of Method F. Vavro, Petitioner v. Commonwealth of Pennsylvania, Workmen’s Compensation Appeal Board and Bethlehem Mines, Respondents. Commonwealth Court of Pennsylvania.Argued September 17, 1981 December 29, 1981. Workmen’s compensation — Burden of proof — Scope of appellate review — The Pennsylvania Workmen’s Compensation Act, Act of June 2, […]