Court of Appeals for the Fourth Circuit April 1, 1957, 7122 (District 50, United Mine Workers of America v. National Labor Relations Board, Pittsburg Valve Company, Sterling Manufacturing Company, and Hardware Brass Manufacturing Company v. National Labor Relations Board)

242 F.2d 837 DISTRICT 50, UNITED MINE WORKERS OF AMERICA, Petitioner. v. NATIONAL LABOR RELATIONS BOARD, Respondent. PITTSBURG VALVE COMPANY, Sterling Manufacturing Company, and Hardware Brass Manufacturing Company, Petitioners, v. NATIONAL LABOR RELATIONS BOARD, Respondent. No. 7107. No. 7122. United States Court of Appeals Fourth Circuit. Argued March 12, 1957. Decided April 1, 1957.