No. 81-1491. Submitted November 12, 1981. Decided January 21, 1982. Richard Michael Fischl, William R. Stewart, Deputy Asst. Gen. Counsel, David R. Marshall, Atty., William A. Lubbers, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Robert E. Allen, Acting Associate Gen. Counsel, Elliott Moore, Deputy Associate Gen. Counsel, N.L.R.B., for petitioner. Benjamin J. Francka, Springfield, Mo., for International Brotherhood of Electrical Workers, AFL-CIO, Local 453. Appeal from the National Labor