325 A.2d 346 James C. McDowell, Appellant, v. Workmen’s Compensation Appeal Board and Humble Oil Refining Company, Appellees. Commonwealth Court of Pennsylvania.Submitted on briefs July 31, 1974. September 10, 1974. Workmen’s compensation — Findings of referee — Sufficient evidence — Burden of proof — Causation — Medical testimony. 1. In a workmen’s compensation case the […]