In N.L.R.B. v. Sanson Hosiery Mills, 5 Cir., 195 F.2d 350, this court held that when the Board has duly certified a bargaining representative, such certification must be respected by the employer until set aside by the Board, even though the Union has meanwhile lost its majority support of the employees.
In NLRB v. Vulcan Forging Co., 188 F.2d 927 (6th Cir. 1951), the court held that in determining whether the NLRB had jurisdiction over a company which sold all of its output to Ford Motor Company, judicial notice could be taken of the interstate activities of Ford.