No. 91-3901. Argued September 25, 1992. Decided October 21, 1992. Lee W. Jackson, Martin Ganzglass, O'Donnell, Schwartz Anderson, Washington, D.C., Thomas F. Phalen, Jr. (argued), Logothetis Pence, Cincinnati, Ohio, for petitioner. Robert J. Englehart (argued), N.L.R.B., Contempt Litigation Branch, Aileen A. Armstrong, Appellate Court, Enforcement Litigation, Washington, D.C., for respondent. Lawrence T. Zimmerman (argued), Washington, D.C., Charles M. Roesch, Dinsmore Shohl, Cincinnati, Ohio, for