OIL, CHEMICAL AND ATOMIC WORKERS INTERNATIONAL UNION, AFL-CIO, Petitioner, v. NATIONAL LABOR RELATIONS BOARD, Respondent, George A. Angle, d/b/a Kansas Refined Helium Company, Intervenor. George A. ANGLE, d/b/a Kansas Refined Helium Company, Petitioner, v. NATIONAL LABOR RELATIONS BOARD, Respondent. Nos. 23295, 23300, 23750, 23751.United States Court of Appeals, District of Columbia Circuit.Argued November 3, 1970. […]