[47] Ibid. 345, 346.
[48] New York v. United States, 257 U.S. 591 (1922).
[49] Northwestern Electric Co. v. Federal Power Commission, 321 U.S. 119 (1944). See also Federal Power Commission v. East Ohio Gas Company, 338 U.S. 404 (1950).
[50] Helvering v. National Grocery Co., 304 U.S. 282 (1938).
[51] Helvering v. Northwest Steel Mills, 311 U.S. 46 (1940).