Eff. 12/31/72; AMD, Eff. 9/5/76; AMD, 1978 MAR p. 78, Eff. 1/26/78; AMD, 1979 MAR p. 154, Eff. 2/16/79; TRANS, from Dept. of Prof. & Occup. Lic., Ch. 274, L. 1981, Eff. 7/1/81; TRANS, from Dept. of Commerce, Ch. 728, L. 1985, Eff. 7/1/85; REP, 1986 MAR p. 1699, Eff. 10/17/86.