8. Nothing in this section contained shall be construed to impose a tax upon sales, agreements to sell, memoranda of sales, deliveries or transfers of shares or certificates
- (a) issued under a noncorporate investment trust agreement of the fixed type and no such sale, agreement to sell, memorandum of sale, delivery or transfer shall result in imposing a tax under this section on the securities held in such an investment trust; or
- (b) of an investment trust between the investment trust and an underwriter, between an underwriter and a dealer in securities or between an underwriter or dealer and an investor. As used in this paragraph, the term "investment trust" means an investment trust of the management type, the shareholders of which are, upon reasonable notice, entitled to require the investment trust to redeem or repurchase their shares or certificates for their proportionate interest in the property of the investment trust, or the cash equivalent thereof, less a discount of not more than three per centum thereof, and the term "underwriter" means a person, firm or corporation who has entered into an agreement with such investment trust to effectuate, alone or through others, sales of shares or certificates of the investment trust.