Sub Section 4 "Notwithstanding anything contained in sub section (3) of this section or subsection(1) of section 16, where it appears to the Central Government , whether on an application; made to it in this behalf or otherwise, that the employer and the majority of employees in relation to any establishment have agreed that the provisions of this Act should be made applicable to the establishment it may by notification in the Official Gazette, apply the provisions of this Act to that establishment." Sub Section 5 "An establishment to which this Act applies shall continue to be governed by this Act notwithstanding that the number of persons employed therein at any time falls below twenty Provided that where, for a continuous period of not less than one year the number of persons employed therein has been less than, fifteen the employer in relation to such establishment may cease to give effect to the provisions of this Act and any scheme framed thereunder, with effect from the beginning of the month following the expiry of the said period of one year, but he shall, within one month, of the date, of such cessation, intimate, by.