Materials for use in the manufacture of goods of Section XVI, of Chapter 40, 73 or 90, or of heading 59.10 or 87.05 (excluding the motor vehicle chassis portion and parts thereof), such goods being used in the exploration, discovery, development, maintenance, testing, depletion or production of oil or natural gas wells up to and including the wellhead assembly or surface oil pumping unit.

1. 1. The provisions of this Chapter are not subject to the rule of specificity in General Interpretative Rule 3 (a).

2. 2. Goods which may be classified under the provisions of Chapter 99, if also eligible for classification under the provisions of Chapter 98, shall be classified in Chapter 98.

3. 3. Goods may be classified under a tariff item in this Chapter and be entitled to the Most-Favoured-Nation Tariff or a preferential tariff rate of customs duty under this Chapter that applies to those goods according to the tariff treatment applicable to their country of origin only after classification under a tariff item in Chapters 1 to 97 has been determined and the conditions of any Chapter 99 provision and any applicable regulations or orders in relation thereto have been met.

4. 4. The words and expressions used in this Chapter have the same meaning as in Chapters 1 to 97.