90.2

a) Where there are two or more applicants and the applicants have not appointed an agent representing all of them (a “common agent”) under Rule 90.1a), one of the applicants who is entitled to file an international application according to Article 9 may be appointed by the other applicants as their common representative.
b) Where there are two or more applicants and all the applicants have not appointed a common agent under Rule 90.1a) or a common representative under paragraph a), the applicant first named in the request who is entitled according to Rule 19.1 to file an international application with the receiving Office shall be considered to be the common representative of all the applicants.