140 N.W.2d 921 STANLEY C. NELSON, CLINTON J. ERICKSON and COUNCIL BLUFFS FARM EQUIPMENT, INC., a corporation, appellants, v. GERALD A. LEADERS, appellee. No. 51930.Supreme Court of Iowa. March 8, 1966. CONTRACTS: Restrictive covenant — engaging in similar business 1 — failure of defendant to plead invalidity — waiver. Defendant in an action to enforce […]