Apparatus for the treatment of air or other gases, but excluding natural gas, by means of pressure and deep temperatures; apparatus for the separation or enrichment of air or other gases, but excluding natural gas, with the aid of adsorption agents and semipermeable membranes; apparatus for the production of hydrogen through steam reforming

'adsorpt':40 'agent':41 'aid':38 'air':6,28 'apparatus':1,21,45 'deep':19 'enrich':26 'exclud':11,33 'gas':13,35 'gase':9,31 'hydrogen':50 'mean':15 'membran':44 'natur':12,34 'pressur':17 'product':48 'reform':53 'semiperm':43 'separ':24 'steam':52 'temperatur':20 'treatment':4

Installation, assembly, repair, maintenance, service and security check of apparatus for the production of nitrogen, oxygen and hydrogen, but excluding natural gas, for others

'apparatus':10 'assembl':2 'check':8 'exclud':20 'gas':22 'hydrogen':18 'instal':1 'mainten':4 'natur':21 'nitrogen':15 'other':24 'oxygen':16 'product':13 'repair':3 'secur':7 'servic':5

Design for others of apparatus for the production of nitrogen, oxygen and hydrogen, but excluding natural gas, for use in industry

'apparatus':5 'design':1 'exclud':15 'gas':17 'hydrogen':13 'industri':21 'natur':16 'nitrogen':10 'other':3 'oxygen':11 'product':8 'use':19

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