71(1)Where a trade union or council of trade unions that makes an application for certification or for a declaration concerning the status of a successor trade union or council of trade unions or that files an intervention has not been found by the Board to be a trade union or council of trade unions within the meaning of the definition of “trade union” or “council of trade unions” in subsection 1(1) of the Act, as the case may be, in a previous proceeding under the Act, the Chief Executive Officer shall serve upon the parties to the application and upon any trade union or council of trade unions upon whom he is required to effect service under subsection 9(1) or 91(1) a notice to that effect in Form 50-1781, provided by the Board, and he shall also attach such a notice to any notice to employees of the making of an application that an employer is required to post under section 4, 5, 6, 11, 22, 26, 86, 89 or 93 and to any other notice to employees of the making of an application as the Board may direct.