§ 296. Continuation of certain tables and rates. All tables, schedules, rates (including but not limited to regular and special deficiency rates), regular and special deficiency periods, and other actuarial tables, rates and procedures in effect and used by the employees' retirement system for or in connection with any of its activities or operations with respect to the membership of police officers and firefighters and persons who are members of such system pursuant to sections eighty-one through eighty-eight, inclusive, shall continue to be used in the same manner by the retirement system established by this article, and shall remain in effect unless and until duly modified or rescinded by the provisions of this article.