Continuance of development rebate preserves rebate for qualifying ships and plant where contracts or manufacturing steps predated the cut-off. The notification S.O. 2167 under section 33(5) will not apply to specified ships and plant so that the development rebate continues where conditions are met: ships acquired in the prescribed period if a purchase contract existed before 1 December 1973; coal-fired equipment or conversions installed in the prescribed period; and other plant installed in the prescribed period if purchased, contracted for, or steps taken for manufacture before 1 December 1973, with Income-tax Act provisions applying subject to these conditions.