McMahon v. Christmann , 157 Tex. 403 ( 1957 )
Texas Co. v. Parks , 247 S.W.2d 179 ( 1952 )
Hastings v. Pichinson , 370 S.W.2d 1 ( 1963 )
Shell Oil Co. v. Goodroe , 197 S.W.2d 395 ( 1946 )