"exemption certificate"

means such a certificate, issued in conformity with the Safety Convention under paragraph (c) of section 192, subparagraph (a) or (b) of paragraph (2) or subparagraph (a) of paragraph (4) of section 193, or deemed in accordance with the provisions of section 202(1)(a) or (b) to have been so issued;

[Definition substituted by section 1(g) of Act No. 23 of 1997]