In Bonwit Teller, Inc. v. National Labor Relations Board, 2 Cir., 197 F.2d 640, 645, it appeared that the Board, apparently because of considerations mentioned in the May case, supra, having authorized a practice of allowing retail department stores the privilege of prohibiting all solicitation within the selling areas of the stores during both working and non-working hours, Bonwit Teller, a retail department store, availed itself of that privilege.