Quinn v. American Spiral Spring Mfg. Co. , 293 Pa. 152 ( 1928 )
Summit Hotel Co. v. N. Broadc'st'g Co. , 336 Pa. 182 ( 1939 )
Valley Smokeless C. Co. v. Mfrs.' W. Co. , 295 Pa. 40 ( 1928 )
Dussell v. Kaufman Construction Co. , 398 Pa. 369 ( 1960 )