Where an order has been made under section 3 reserving any article or class of articles for exclusive production by handlooms, such article or class of articles shall not, on and from the date of reservation, be produced by any loom, other than handloom:
     Provided that any person who, immediately before the date of reservation of any article or class of articles, was engaged in the production of such article or class of articles in any loom, other than handloom may continue to be so engaged till the expiry of three months from the date of such reservation.