Article 12. The mayor of town or village (including the special ward), which does not establish the welfare office, shall, in connection with the rehabilitation and relief of the disabled persons who have residence within the town or village concerned, cooperate in the administrative affairs executed by the governor of To, Do, Fu or prefecture, the mayor of city, and the mayor of town or village who operates the welfare office (hereinafter referred to as the "administrative organ of relief" ) or by the director of welfare office.