258 A.2d 634 Abbotts Dairies, Inc. et al., Appellants, v. Philadelphia. Supreme Court of Pennsylvania.May 5, 1969. November 11, 1969. Taxation — Perpetual injunction prohibiting city from imposing mercantile license tax upon defendants — Injunction procedurally improper — Modification to permit assertion of tax liability only as to years after parties were put on notice […]