National Labor Relations Board v. Duncan Foundry and MacHine Works, Inc. , 435 F.2d 612 ( 1970 )
National Labor Relations Board v. Winkel Motors, Inc. , 443 F.2d 38 ( 1971 )
National Labor Relations Board v. Ayer Lar Sanitarium , 436 F.2d 45 ( 1970 )