HGSS

Metal goods for use in drilling and completing oil and gas wells and in the production of oil and gas from wells, namely, metal valves not being parts of machines, branching tube connectors of metal for pipelines, drilling risers, casing connectors for drilling risers, pipeline casing connectors, subsea casing connectors for drilling risers, subsea pipeline casing connectors, metal to metal seals for use in the oil and gas industries, high pressure seals for drilling risers, and high pressure seals

Metal goods for use in drilling and completing oil and gas wells and in the production of oil and gas from wells, namely, wellheads, geothermal wellheads, subsea wellheads, wellhead connectors in the nature of pipe fittings and flanges

Construction, installation and maintenance of oil and gas well structures

Design of oil and gas well structures