72 Pa. Stat. § 5966
That all tax liens heretofore filed in the office of the prothonotary of the various counties instead of the office of the county commissioners as provided by the act of Assembly, approved the first day of June, Anno Domini one thousand nine hundred and fifteen (Pamphlet Laws, six hundred and sixty), entitled "An act to amend an act, approved the twenty-first day of May, Anno Domini one thousand nine hundred and thirteen, entitled 'An act providing for the return of taxes on seated lands in counties, poor districts, boroughs, incorporated towns, and townships for county poor, borough, town, or township taxes, respectively, and providing for the sale of such lands for taxes,' so as to include school taxes," be, and the same are hereby, validated and made effectual as if the above said act had not been passed.
All such tax liens, as filed in the office of the prothonotary, shall be collected in the manner provided in the act of Assembly, approved the fourth day of June, Anno Domini one thousand nine hundred and one (Pamphlet Laws, three hundred and sixty-four), entitled "An act providing when, how, upon what property, and to what extent, liens shall be allowed for taxes, and for municipal improvements, and for the removal of nuisances; the procedure upon claims filed therefor; the methods for preserving such liens and enforcing payment of such claims; the effect of judicial sales of the properties liened, and the manner of distributing the proceeds of such sales," and its several supplements and amendments thereto, and with like force and effect as if the said act of June first, one thousand nine hundred and fifteen (Pamphlet Laws, six hundred and sixty), had not been passed: Provided, The tax liens shall in other respects be legal and valid: And provided further, That this act shall not apply to any cases already adjudicated or to any suits now pending and undetermined.
72 P.S. § 5966