Helvering v. Mitchell , 58 S. Ct. 630 ( 1938 )
Burnet v. Houston , 51 S. Ct. 413 ( 1931 )
Taft v. Helvering , 61 S. Ct. 244 ( 1940 )
Helvering v. Janney , 61 S. Ct. 241 ( 1940 )