
    No. 472.
    No. 473.
    No. 474.
    No. 475.
    Helvering, Commissioner of Internal Revenue, v. Gambrill; Helvering, Commissioner of Internal Revenue, v. Campbell; Helvering, Commissioner of Internal Revenue, v. Knox; and Helvering, Commissioner of Internal Revenue, v. Rogers.
    April 28, 1941.
     