No. 72-2279. Argued February 7, 1973. Decided May 4, 1973. L. Patten Mason, Beaufort, N.C., Ellis L. Aycock, Wilmington, N.C., and John A. Mraz, Charlotte, N.C. (Wheatly Mason, Beaufort, N.C., Stevens, McGhee, Aycock, Morgan Lennon, Wilmington, N.C., and Mraz, Aycock Casstevens, Charlotte, N.C., on brief), for appellants. Hubert Humphrey, Greensboro, N.C. (McLendon, Brim, Brooks, Pierce Daniels, Greensboro, N.C., on brief), for General Steel Tank Co., Inc. Larry B. Sitton, Greensboro, N.C. (Smith