Importer means any person who imports a chemical substitute into the United States. Importer includes the person primarily liable for the payment of any duties on the merchandise or an authorized agent acting on his or her behalf. The term also includes, as appropriate:
(1) The consignee;
(2) The importer of record;
(3) The actual owner; and
(4) The transferee, if the right to draw merchandise in a bonded warehouse has been transferred.