Nos. 89-4892. 90-4047. April 18, 1991. James S. Horwitz, Houston, Tex., for Texas World Service Co., Inc. Patrick W. Jordan, Keck, Mahin Cate, San Francisco, Cal., for Song Ae Lim. Robert F. Mace, Linda J. Dreeben, and Aileen Armstrong, Deputy Associate Gen. Counsel, N.L.R.B., Washington, D.C., for N.L.R.B. Robert H. Miller, Regional Director, N.L.R.B., San Francisco, Cal., for other interested parties. On petition for review and cross-application for enforcement of an order of the national labor