Casing and tubing, of a kind used in drilling for oil or gas, welded, of an external diameter <= 406.4 mm, of steel other than stainless steel
Zaščitne (""casing"") in proizvodne cevi (""tubing""), varjene, za pridobivanje nafte ali plina, zunanji premer <= 406,4 mm, iz jekla (razen nerjavnega)