Explanatory notes
… kind used for oil or gas pipelines : 7306.11 - - Welded, of stainless steel 7306.19 - - Other - Casing and … used in drilling for oil or gas : 7306.21 - - Welded, of stainless steel 7306.29 - - Other 7306.30 - Other, welded, … 7306.40 - Other, welded, of circular cross-section, of stainless steel 7306.50 - Other, welded, of circular …