No. 74-2610. January 26, 1976. William E. Mitch, Birmingham, Ala., Jack Drake, Tuscaloosa, Ala., Harrison Combs, Washington, D.C., for defendants-appellants. M. L. Taliaferro, C. V. Stelzenmuller, Birmingham, Ala., for plaintiff-appellee. John J. Coleman, Jr., James P. Alexander, Stephen E. Brown, Birmingham, Ala., amicus curiae in support of petition for rehearing for U.S. Pipe Foundry Co. Charles F. Wilson, Tampa, Fla., amicus curiae in support of petition for rehearing. Appeals from the United