(4)[The investing company shall not make any investment in the shares of any other body corporate in excess of the percentages specified in sub-section (2) and the proviso thereto, unless the investment is sanctioned by a resolution of the investing company in general meeting and [unless previously approved] [Substituted by Act 65 of 1960, Section 138, for Section 372 (w.e.f. 28.12.1960). ][by the Central Government:Provided that the investing company may at any time invest up to any amount in shares offered to it under clause (a) of sub-section (1) of section 81 (hereafter in this section referred to as rights shares) irrespective of the aforesaid percentages:Provided further that when at any time the investing company intends to make any investments in shares other than rights shares, then, in computing at that time any of the aforesaid percentages, all existing investments, if any, made in rights shares up to that time shall be included in the aggregate of the investments of the company.