Liquefied petroleum gas; solidified gas being fuel; oil-gas; natural gas; propane gas; vaporized fuel mixtures; gas oil; crude oil for fuel; gasoline; fuel for lighters

'crude':20 'fuel':7,16,23,25 'gas':3,5,10,12,14,18 'gasolin':24 'lighter':27 'liquefi':1 'mixtur':17 'natur':11 'oil':9,19,21 'oil-ga':8 'petroleum':2 'propan':13 'solidifi':4 'vapor':15

Natural gas exploration; research in the field of natural gas exploration; analysis for natural gas exploitation; oil-well testing; product safety testing of gas apparatus; product safety testing of gas supplying plumbing apparatus

'analysi':12 'apparatus':26,34 'exploit':16 'explor':3,11 'field':7 'gas':2,10,15,25,31 'natur':1,9,14 'oil':18 'oil-wel':17 'plumb':33 'product':21,27 'research':4 'safeti':22,28 'suppli':32 'test':20,23,29 'well':19

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