Occupations: hearing aid; regulation of hearing aid dealers; modify. Amends secs. 303a & 411 of 1980 PA 299 (MCL 339.303a & 339.411) & repeals art. 13 of 1980 PA 299 (MCL 339.1301 - 339.1309 ) & sec. 31 of 1979 PA 152 (MCL 338.2231 ).