471 A.2d 119 Edwards Engineering Corporation, Appellant v. Wayne Davies et al., Appellees. Commonwealth Court of Pennsylvania.Argued April 6, 1983 January 30, 1984. Subdivision — Mandamus — Pennsylvania Municipalities Planning Code, Act of July 31, 1968, P.L. 805 — Hearing. 1. Mandamus is an extraordinary writ which lies to compel the performance of a ministerial […]