437 A.2d 115 Howard Hanna, III, Appellant v. Zoning Board of Adjustment of Pittsburgh, Appellee. Commonwealth Court of Pennsylvania. November 25, 1981. Zoning — Service — Mail — Judicial Code, 42 Pa. C. S. § 5572 — Burden of proof — Postmark. 1. Where service of a zoning board of adjustment’s order denying a variance […]