72 Pa. Stat. § 4753-4 : Statutes (Unconsolidated) — TAXATION AND FISCAL AFFAIRS — LOCAL TAXATION —EXEMPTIONS —FILING DEADLINE EXTENSION —4 - Retroactivity TEXT PDF This act shall be retroactive to August 2, 1990. 72 P.S. § 4753-4 1991, March 26, P.L. 3, No. 2, § 4, imd. effective.