64. The holder of a 5th class heating and steam engine certificate or a Class D or C certificate for refrigerating apparatus, on 1 September 1981, is immediately eligible for the examination leading to a 4th class heating and steam engine certificate or to a Class B certificate for refrigerating apparatus, as the case may be.
R.R.Q., 1981, c. M-6, r. 1, s. 64.