(3) Any contributor who elected to c
ount as pensionable service any period of elective service, specified in clause 5(1)(b)(i)(A) of the Act, or who elects to c
ount as pensionable service any period of elective service, specified in clause 5(1)(b)(i)(B), during which he was engaged, otherwise than on a fu
ll-time basis, as a postmaster in a revenue post office or as an assistant to a postmaster in a revenue post office, shall be dee
...[+++]med, for the purposes of subsection 10(1) of the Act and for the purposes of paragraphs 10(6)(b) and (c) of the Act, to have been, while so engaged, employed in the Public Service if, in the case of an assistant to a postmaster in a revenue post office, the Deputy Postmaster General certifies in the form prescribed by the Minister, that