The duration to bargain collectively on behalf of the workers of the authorised Trade Union recognized pursuant in Section 11 with the management shall remain valid for two years from the date of issue of the certificate by the Registrar pursuant to Sub-section (3) of the same Section.
Provided that in cases where the registration of such Authorized Trade Union is cancelled or such Trade Union is dissolved, the election for another Authorized Trade Union shall be conducted within three months from the date of
such cancellation or dissolution