No. 25420. December 11, 1968. S. Tom Morris, Gibson, Ochsner, Harlan, Kinney Morris, Amarillo, Tex., for petitioner. Marcel Mallet-Prevost, Asst. Gen. Counsel, Arnold Ordman, Gen. Counsel, Dominick L. Manoli, Associate Gen. Counsel, Robert E. Williams, Michael N. Sohn, Attys., NLRB, Washington, D.C., for respondent. Before RIVES and DYER, Circuit Judges, and MEHRTENS, District Judge. RIVES, Circuit Judge: Mason Hanger-Silas Mason Co., Inc. (Company herein) petitions, pursuant to 29 U.S.C.A. § 160(f)