45.3. Where an undertaking subject to the Canada Labour Code (Revised Statutes of Canada, 1985, chapter L-2) as regards labour relations becomes, in that regard, subject to the legislative authority of Québec, the following provisions shall apply :
(1) a certification granted, a collective agreement made and proceedings commenced under the Canada Labour Code for the securing of certification or the making or carrying out of a collective agreement are deemed to be a certification granted, a collective agreement made and filed and proceedings commenced under this Code ;
(2) the employer remains bound by the certification or collective agreement or, where section 45 would have been applicable had the undertaking been under the legislative authority of Québec, the new employer becomes bound by the certification or collective agreement as if the employer were named therein and becomes ipso facto a party to any related proceeding in the place and stead of the former employer ;
(3) proceedings in progress for the securing of certification or the making or carrying out of a collective agreement shall be continued and decided according to the provisions of this Code, with the necessary modifications.
However, the collective agreement made by an uncertified association binds the new employer only until the expiry of 90 days after the date of alienation or transfer of operation if the association has not filed, during that time, a petition for certification in respect of the bargaining unit governed by the collective agreement or in respect of an essentially similar unit. If such a petition for certification is filed within that time, the collective agreement continues to bind the new employer until the date of a decision rendered by the Commission refusing, as the case may be, to grant certification.
No certification may be applied for by another association of employees in respect of such a bargaining unit before the expiry of 90 days or, if a petition for certification is filed during that time, before the date of the decision of the Commission refusing, as the case may be, to grant certification.