Harmonized System

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Section XV > Chapter 73 > Heading 7305 > 7305.3

Other, welded 

Section XV > Chapter 73 > Heading 7305 > 7305.1 > 7305.11

Longitudinally submerged arc welded

Section XV > Chapter 73 > Heading 7305 > 7305.1 > 7305.12

Other, longitudinally welded

Section XV > Chapter 73 > Heading 7305 > 7305.20

Casing of a kind used in drilling for oil or gas

Section XV > Chapter 73 > Heading 7305 > 7305.3 > 7305.31

Longitudinally welded

Section XV > Chapter 73 > Heading 7306

Other tubes, pipes and hollow profiles (for example, open seam or welded, riveted or similarly closed), of iron or steel.

Section XV > Chapter 73 > Heading 7306 > 7306.1

Line pipe of a kind used for oil or gas pipelines