140. However, in the exercise of the powers assigned to it by sections 138 and 139, no federation shall(a) invest more than thirty per cent of its assets in shares;
(b) invest in shares an amount equal to more than three per cent of the total assets of the unions affiliated with it;
(c) hold more than thirty per cent of the common shares of the same corporation, except a corporation contemplated in section 138;
(d) invest more than ten per cent of its assets in the common shares of the same corporation contemplated in section 138;
(e) invest more than three per cent of its assets in the common shares of the same corporation other than a corporation contemplated in section 138.