Common metals and their alloys; goods of metal included in this class, particularly, metal tubes provided with a wear protection layer, connectors and branching tubes of metal, as well as metal ducts provided with a wear protection layer, all for conveying solids, liquids and gases for natural gas pipelines and tubes

'alloy':5 'branch':24 'class':12 'common':1 'connector':22 'convey':41 'duct':32 'gas':48 'gase':45 'good':6 'includ':9 'layer':21,38 'liquid':43 'metal':2,8,14,27,31 'natur':47 'particular':13 'pipelin':49 'protect':20,37 'provid':16,33 'solid':42 'tube':15,25,51 'wear':19,36 'well':29

[ Material processing, namely, coating of metal surfaces and hardening of metal surfaces, ] providing information in the field of material processing, namely, about making protective layers, wear protection layers on metal parts, and protective layers on metal tubes for tubes and pipeline systems

'coat':4 'field':17 'harden':9 'inform':14 'layer':25,28,34 'make':23 'materi':1,19 'metal':6,11,30,36 'name':3,21 'part':31 'pipelin':41 'process':2,20 'protect':24,27,33 'provid':13 'surfac':7,12 'system':42 'tube':37,39 'wear':26

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