B-1.1, r. 10 - Regulation respecting the rules of practice of the Régie du bâtiment du Québec

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11. To be admitted as a representative of a petitioner or a licence holder in a proceeding, the representative must produce a written appearance for the record as well as a copy of his mandate, save if representation is by advocate.
O.C. 1559-83, s. 11.