Duty exemption for goods supplied to radar projects requires a certificate confirming purchase orders and intended use. Exemption for all goods manufactured by an Indian Offset Partner and supplied for use in radars acquired under contract, contingent on a duty exemption certificate from an authorized officer certifying: the procuring agency's purchase order on the contractor; the contractor's purchase order on the IOP with quantity and description; and that the goods are intended for use in the acquired radars. The exemption is limited by an explicit expiry provision.