PIONEER DRILLING CO., Inc., Petitioner, v. NATIONAL LABOR RELATIONS BOARD, Respondent. No. 9618.United States Court of Appeals, Tenth Circuit. April 5, 1968. George C. Dunlap, of Blanchette, Smith Shelton, Dallas, Tex., for petitioner. Robert S. Hillman, Washington, D.C. (Arnold Ordman, Gen. Counsel, Dominick L. Manoli, Associate Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, and Lawrence […]