(c) Refractory goods of heading 6903; ceramic wares for laboratory, chemical or other technical uses, of heading 6909; (d) Glass mirrors , not optically w orked, of heading 7009, or mirrors of base metal or of precious metal, not being optical elements (heading 8306 or chapter 71); (e) Goods of heading 7007, 7008, 7011, 7014, 7015 or 7017;