computers and parts thereof used for measuring torque and torque control in the oil drilling field

'comput':1 'control':11 'drill':15 'field':16 'measur':7 'oil':14 'part':3 'thereof':4 'torqu':8,10 'use':5

common metals and their alloys used in oil field tubular goods

'alloy':5 'common':1 'field':9 'good':11 'metal':2 'oil':8 'tubular':10 'use':6

complete line of oil field machines and machine tools particularly used in handling and installation of oil field casing

'case':19 'complet':1 'field':5,18 'handl':13 'instal':15 'line':2 'machin':6,8 'oil':4,17 'particular':10 'tool':9 'use':11

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