2833.21 Magnesium sulphate 2833.21.00 A 2833.21.00 A 2833.21.01 A
2833.22 Aluminium sulphate 2833.22.10 D 2833.22.00 D 2833.22.01 C
2833.22.90 A
2833.23 Chromium sulphates 2833.23.10 D 2833.23.00 A 2833.23.01 C
2833.23.90 A
North American Free Trade Agreement, 1992 Oct. 7 Tariff Phasing Descriptions · 第 168 / 531 题