Trade union registration issues a conclusive certificate and allows cancellation for contravention or low membership. The Registrar registers a trade union and issues a certificate of registration as conclusive evidence after verifying compliance; previously registered unions are deemed registered on filing updated executive constitution and rules. The Registrar may cancel or withdraw a certificate on the union's verified application, on information of contravention, or if membership falls below ten per cent. of total workers or one hundred workers, with at least sixty days' written notice except when applied for by the union; a Tribunal order also mandates cancellation and the Registrar must record and communicate reasons.