Tax Court February 1957 casesParker Drilling Co. v. Comm'r of Internal RevenueClarke v. Comm'r of Internal RevenueNat'l Bank of Commerce of Seattle v. Comm'r of Internal RevenueKatz v. Comm'r of Internal RevenueClayton Coal Co. v. Comm'r of Internal RevenueBeck Chem. Equip. Corp. v. Comm'r of Internal RevenueLedanois Land & Stone Co. v. Comm'r of Internal Revenue