Two landmark court cases, ''Schultz v. Wheaton Glass Co.'' (1970), U.S. Court of Appeals for the Third Circuit and ''Corning Glass Works v. Brennan'' (1974), [[U.S. Supreme Court]] tightened and refined the language of the act. | Two landmark court cases, ''Schultz v. Wheaton Glass Co.'' (1970), U.S. Court of Appeals for the Third Circuit and ''Corning Glass Works v. Brennan'' (1974), [[U.S. Supreme Court]] tightened and refined the language of the act. |