Drilling of wells; installation, repair, maintenance and rental of machinery for drilling fluid relief and associated pumps and pressure gauges, for use in oil and gas production

'associ':16 'drill':1,12 'fluid':13 'gas':26 'gaug':20 'instal':4 'machineri':10 'mainten':6 'oil':24 'pressur':19 'product':27 'pump':17 'relief':14 'rental':8 'repair':5 'use':22 'well':3

[ Well drilling machines for use in oil and gas production; pumps for machines for use in oil and gas production; submersible pumps for use in oil and gas production; pressure regulators being parts of machines for use in oil and gas production; back pressure relief valves as parts of machines for use in oil and gas production ]

'back':43 'drill':2 'gas':9,19,28,41,56 'machin':3,13,35,50 'oil':7,17,26,39,54 'part':33,48 'pressur':30,44 'product':10,20,29,42,57 'pump':11,22 'regul':31 'relief':45 'submers':21 'use':5,15,24,37,52 'valv':46 'well':1

EC-DRILL

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