388 A.2d 1166 Richard Walther, Petitioner v. Commonwealth of Pennsylvania, Workmen’s Compensation Appeal Board and B P Motor Express Co., Respondents. Commonwealth Court of Pennsylvania.Argued April 3, 1978 August 3, 1978. Workmen’s compensation — Scope of appellate review — Error of law — Violation of constitutional rights — Findings of fact — Substantial evidence — […]