Treatment of common metals, treatment of precious metals, treatment of metallic ores, treatment of metal alloys and treatment of chemicals; processing and treatment of ores and metals; processing and refining of oil and gas; extraction of metals from minerals

'alloy':16 'chemic':20 'common':3 'extract':35 'gas':34 'metal':4,8,11,15,27,37 'miner':39 'oil':32 'ore':12,25 'precious':7 'process':21,28 'refin':30 'treatment':1,5,9,13,18,23

[ Industrial oils, crude oil, diesel oil, petroleum ether, raw and refined petroleum; natural and synthetic fuel gases, coal, coke, coal naphtha and coal tar oil ]

'coal':18,20,23 'coke':19 'crude':3 'diesel':5 'ether':8 'fuel':16 'gase':17 'industri':1 'naphtha':21 'natur':13 'oil':2,4,6,25 'petroleum':7,12 'raw':9 'refin':11 'synthet':15 'tar':24

Common metals and their alloys, unwrought or semi-wrought; [ ferroalloys; ] ores of metal

'alloy':5 'common':1 'ferroalloy':11 'metal':2,14 'ore':12 'semi':9 'semi-wrought':8 'unwrought':6 'wrought':10

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