In the event of the death:
a. – of the manager of a limited liability company or an unlisted partnership limited by shares,
b. – of one of the partners in name of a partnership,
c. – of one of the persons who assume the general management of an unlisted company limited by shares,
d. – the operator of a business or a customer base,
e. – the holder of a public or ministerial office,
any depreciation resulting from the said death and affecting the value of the unlisted securities or intangible assets thus transmitted shall be taken into account for the calculation of the death transfer duties payable by his heirs, legatees or donees.