11.(1) All communications and notices to a registered Trade Union shall be sent, insuch manner as may be prescribed, to the address of the head office of the Trade Union as entered in the register maintained by the Registrar.
(2) The Trade Union shall inform the Registrar if the members of such Trade Union falls below ten per cent. of total workers or one hundred workers, whichever is less.
(3) The Trade Union shall inform the Registrar of any change in the particulars given by it in its application for registration and in its constitution or rules, in such manner as may be prescribed.