32 A.2d 749 Mellon Estate. Supreme Court of Pennsylvania.May 24, 1943. June 30, 1943. Decedents’ estates — Practice — Transfer inheritance tax — Tax proration proceeding — Intervention by Commonwealth — Right — Laches — Commonwealth as party in interest — Acts of May 28, 1915, P. L. 616, July 7, 1919, P. L. 731, […]