Section 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 policemen and
  firemen and persons who are members of such system pursuant to  sections
  eighty-one  to 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  shall  remain  in  effect unless and until duly modified or rescinded by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.