All certificates issued under authority contained in PL 12-21 shall expire on 31 Dec of the calendar year in which issued. To renew an unexpired certificate, the certificate holder shall, before the time at which the certificate would otherwise expire, apply for renewal on a form prescribed by the board and pay the renewal fee prescribed by 31.0312. A 2: month grace period will be applicable to this rule. Special certificates issued to ASG tradesmen for use on government work shall not expire but will be in effect as long as the person is employed by the government as a tradesman.History: Bd. of Tradesmen Examiners Regs, eff 28 Dec 72, Reg.2.15.