Metal gas pipelines; metal oil pipelines; manifolds of metal for pipelines; underwater metal pipelines; covers of metal for use in pipeline channels; metal valves for controlling the flow in pipelines; casings of metal for oilwells; pipe casings of metal; reinforcement casings of metal; threaded casings; threads for metal oil and gas pipelines; perforated metallic pipes; crossovers; couplings (joints) made of metal for pipes including internal flush joint couplings; metallic pup joints; metallic bore, crown, well head, guide shoes, centralisers and pipeline parts, fittings and accessories