Kachinski v. Workmen's Compensation Appeal Board , 516 Pa. 240 ( 1987 )
Vinglinsky v. Workmen's Compensation Appeal Board , 139 Pa. Commw. 15 ( 1991 )
Carpentertown Coal & Coke Co. v. Workmen's Compensation Appeal Board , 154 Pa. Commw. 408 ( 1993 )