Catlin v. Northern Coal & Iron Co. , 225 Pa. 262 ( 1909 )
Gorgas v. Philadelphia, Harrisburg & Pittsburg Railroad , 215 Pa. 501 ( 1906 )
Penn. Schuyl. V. R. v. Cleary , 125 Pa. 442 ( 1889 )
Boom Co. v. Patterson , 25 L. Ed. 206 ( 1879 )