15(2)
The appellate authority shall fix a date for the hearing of the appeal and direct notice thereof to be given, –
15(2)(a) where the appeal is filed by the employer, to Trade Union or the negotiating union or negotiating council, as the case may be, or where there is no negotiating union or negotiating council in an industrial establishment or undertaking, any union or such representative body of the workers of the industrial establishment or undertaking;
15(2)(b) where the appeal is filed by a Trade Union or the negotiating union or negotiating council, to the employer and the negotiating union or the negotiating council or all other Trade Unions of the workers of the industrial establishment, as the case may be, or where there is no negotiating union or negotiating council in an industrial establishment or undertaking, any union or such representative body of the workers of the industrial establishment or undertaking; and
15(2)(c) where the appeal is filed by a representative body of the workers, to the employer and other Trade Unions of the workers of the industrial establishment, or where there is no trade union of the workers in an industrial establishment or undertaking, any other worker who joins as a party to the appeal.