Distributions made after December 31, 1953, and before January 1, 1955, as a result of the complete termination of an employees' trust described in section 401(a) which is exempt under section 501(a) shall be considered distributions on account of separation form service for purposes of section 402(a)(2) if the employer who established the trust is a corporation, and the termination of the plan is incident to the complete liquidation of the corporation before August 16, 1954, regardless of whether such liquidation is incident to a reorganization as defined in section 368.