[1977 c.876 §10 (enacted in lieu of 156.610, 156.620, 156.640 and 156.650); 1981 s.s. c.3 §103; 1983 c.763 §43; 1985 c.565 §6; 1987 c.905 §4; repealed by 1995 c.658 §127]