(1) Where there are numerous persons as parties to any proceeding before a Board, Court, Labour Court, Tribunal or Arbitrator and such person are members of trade union or association, the service of notice on the Secretary, or where there is no Secretary, on the Principal Officer of the trade union or association shall be deemed to be service on such persons.
(2) Where there are numerous persons as parties to any proceeding before a Board, Court. Labour Court, Tribunal or Arbitrator and such persons are not members of any trade union or association, the Board, Court.
Labour Court, Tribunal. or Arbitrator, as the case may be, shall, where personal service is not practicable_ cause the service of any notice to be made by affixing the same at or near the marl entrance of the establishment concerned.
(3) A notice exhibited mentioned in sub-rule (2) shall also be considered as sufficient in the case of such workmen as cannot be ascertained and found.