333 A.2d 508 Airco-Speer Electronics and Liberty Mutual Insurance Company, Insurance Carrier, Appellants, v. Workmen’s Compensation Appeal Board and Ruth F. Perry, Appellees. Commonwealth Court of Pennsylvania.Argued December 6, 1974 March 6, 1975. Workmen’s compensation — Scope of appellate review — Violation of constitutional rights — Error of law — Findings of fact — Substantial […]