(iib)[ any interest payable on such debentures, issued by any institution or authority, or any public sector company, or any co-operative society (including a co-operative land mortgage bank or a co-operative land development bank), as the Central Government may, by notification in the Official Gazette, specify in this behalf;] [ Substituted by Act 23 of 1986, Section 29, for Clause (iib) (w.e.f. 1.6.1986).]