Towne v. Eisner ( 1918 )
General Utilities & Operating Co. v. Helvering ( 1935 )
Burnet v. Sanford & Brooks Co. ( 1931 )
North American Oil Consolidated v. Burnet ( 1932 )
Koshland v. Helvering ( 1936 )
Eckert v. Burnet ( 1931 )