No. 80-2211. Argued April 13, 1981. Decided June 15, 1981. Jonathan Saperstein, N.L.R.B., Washington, D.C., for petitioner. Thomas O. Magan, Evansville, Ind., for respondent. Petition from the National Labor Relations Board. Before SWYGERT and CUMMINGS, Circuit Judges, and JAMESON, Senior District Judge. The Honorable William J. Jameson, United States Senior District Judge for the District of Montana, is sitting by designation. SWYGERT, Circuit Judge. The National Labor Relations Board petitions