21.15. The rule provided in section 21.14 applies also where(a) the terms or conditions of a bond or debenture issued pursuant to an agreement in writing referred to in paragraph b of section 21.12 or those of any agreement relating to such a bond or debenture have been changed at a particular time;
(b) under the terms or conditions of a bond or debenture acquired in the ordinary course of the business carried on by a specified financial institution or a partnership or trust, other than a testamentary trust, or under the terms or conditions of any agreement relating to any such bond or debenture, other than an agreement made before 24 October 1979 to which the issuer or any person related thereto was not a party, the owner thereof could at a particular time after 16 November 1978 require, either alone or together with one or more taxpayers, the repayment, acquisition, cancellation or conversion of the bond or debenture otherwise than by reason of a failure or default under the terms or conditions of the bond or debenture or of any agreement that related to, and was entered into at the time of, the issuance of the bond or debenture;
(c) at a particular time a specified financial institution, or a partnership or trust of which a specified financial institution or a person related to such an institution is a member or beneficiary, acquires a bond or debenture thati. was issued before 17 November 1978 or under an agreement in writing referred to in paragraph b of section 21.12,
ii. was issued to a person other than a corporation that was, at the time of issue,(1) a corporation referred to in any of paragraphs a to e of the definition of “specified financial institution” in section 1, or
(2) a corporation controlled by one or more corporations referred to in subparagraph 1,
iii. was acquired from a person that was, at the particular time and at the time the person last acquired the bond or debenture, a person other than a corporation referred to in any of paragraphs a to f of the definition of “specified financial institution” in section 1, and
iv. was acquired otherwise than under an agreement in writing made before 24 October 1979; or
(d) at a particular time after 12 November 1981, a specified financial institution, or a partnership or trust of which a specified financial institution or a person related to such an institution is a member or beneficiary, acquires a bond or debenture thati. was not a bond or debenture referred to in subparagraph c,
ii. was acquired from a person that was, at the particular time, a corporation referred to in any of paragraphs a to f of the definition of “specified financial institution” in section 1, and
iii. was acquired subject to an undertaking given after 12 November 1981 that would be an undertaking referred to in section 740.2 if that section applied to an income bond or income debenture.