Pipe tubes of metal; Copper pipes; Ducts of metal, for central heating installations; Pipework of metal; Fittings of metal for pipes; Ventilating ducts of metal; Metal cable wire; Metal air conditioning ducts; Tubes of stainless steel; Branching tubes of metal for pipelines; Metal thermowells; Ducts and pipes of metal for central heating installations; Metal pipe fittings for compressed air pipes; Metal gutter pipes; Metal pipes and metal fittings therefor