654 A.2d 668 Ray F. LAMBERSON, Petitioner v. WORKMEN’S COMPENSATION APPEAL BOARD (U.S. SILICA, Pennsylvania Glass Sand Corporation, The State Workmen’s Insurance Fund, The Insurance Company of North America), Respondents. PENNSYLVANIA GLASS SAND CORP. and INA/Cigna, Petitioners v. WORKMEN’S COMPENSATION APPEAL BOARD (LAMBERSON), Respondent. Commonwealth Court of Pennsylvania.Submitted on Briefs: December 8, 1994. Decided: February […]