No. 79-1284. Argued October 26, 1979. Decided January 7, 1980. David N. Barkhausen, Chicago, Ill., for petitioner. J. Keith Gorham, N.L.R.B., Washington, D.C., for respondent. Before SWYGERT, CUMMINGS and BAUER, Circuit Judges. CUMMINGS, Circuit Judge. Chicago Magnesium Castings Company has petitioned us to set aside an order of the National Labor Relations Board, while the Board has filed a cross-application for enforcement of its order requiring the Company to bargain in good faith with the Union