10. Every person who had been or who was a member of the Teachers Pension Plan or the Civil Service Superannuation Plan before this plan became applicable to him shall have credited, for pension purposes, or counted, for membership eligibility purposes under this plan, the years and parts of a year of service credited or counted under any of those plans if his contributions have not been refunded.
1986, c. 44, s. 10; 1987, c. 47, s. 167; 2001, c. 31, s. 219.