No. 87-1229. August 8, 1989. Rehearing Denied September 18, 1989. Earl K. Madsen (K. Preston Oade, Jr., with him on the briefs) of Bradley, Campbell Carney, Golden, Colo., for petitioner. Charles P. Donnelly (John H. Ferguson, Rosemary M. Collyer, John E. Higgins, Jr., Robert E. Allen, and Elliott Moore with him on the brief) of the N.L.R.B., Washington, D.C., for respondent. Lawrence Poltrock of DeJong, Poltrock Giampietro, Chicago, Ill., and David M. Silberman and Laurence Gold, Washington, D.C