Zelazny v. Seneca Coal Mining Co. , 275 Pa. 397 ( 1923 )
Kuca v. Lehigh Valley Coal Co. , 268 Pa. 163 ( 1920 )
Roach v. Oswald Lever Co. , 274 Pa. 139 ( 1922 )
Watkins v. Pittsburgh Coal Co. , 278 Pa. 463 ( 1924 )