(a)(i)a new ship or new aircraft acquired after the 31st day of March, 1987 but before the 1st day of April, 1988, if the assessee furnishes evidence to the satisfaction of the Assessing Officer that he had, before the 12th day of June, 1986, entered into a contract for the purchase of such ship or aircraft with the builder or manufacturer or owner thereof, as the case may be;(ii)any new machinery or plant installed after the 31st day of March, 1987 but before the 1st day of April, 1988, if the assessee furnishes evidence to the satisfaction of the Assessing Officer that before the 12th day of June, 1986, he had purchased such machinery or plant or had entered into a contract for the purchase of such machinery or plant with the manufacturer or owner of, or a dealer in, such machinery or plant, or had, where such machinery or plant has been manufactured in an undertaking owned by the assessee, taken steps for the manufacture of such machinery or plant: