No. 30416. April 30, 1971. Rehearing Denied and Rehearing En Banc Denied July 6, 1971. Marcel Mallet-Prevost, Asst. Gen. Counsel, N.L.R.B., Washington, D.C., Clifford Potter, Director, N.L.R.B., Houston, Tex., Avrum M. Goldberg, N.L.R.B., Washington, D.C., Arnold Ordman, Gen. Counsel, Dominick L. Manoli, Associate Gen. Counsel, Herman M. Levy, Atty., N.L.R.B., for petitioner. Charles R. Vickery, Jr., Vickery, McConnell Rowland, Houston, Tex., for respondent, Big Three Industrial Gas Equipment Co