317 A.2d 922 Foster Wheeler Corporation and Liberty Mutual Insurance Company, Insurance Carrier, Appellants, v. Workmen’s Compensation Appeal Board and Joseph Lengen, Appellees. Commonwealth Court of Pennsylvania.Argued March 7, 1974 April 16, 1974. Workmen’s compensation — Scope of appellate review — Violation of constitutional rights — Error el law — Findings of fact — Substantial […]