engineering, geological estimations and research, and computer programming for others, all in the field of oil, gas and geothermal well drilling; testing analysis and treating of oil, gas and geothermal well workings; and oil, gas and geothermal field exploration

'analysi':23 'comput':7 'drill':21 'engin':1 'estim':3 'explor':39 'field':14,38 'gas':17,28,35 'geolog':2 'geotherm':19,30,37 'oil':16,27,34 'other':10 'program':8 'research':5 'test':22 'treat':25 'well':20,31 'work':32

oil, gas and geothermal well drilling, cementing and pressure grouting services; construction and installation of pneumatic bulk material handling systems for bulk material handling

'bulk':17,22 'cement':7 'construct':12 'drill':6 'gas':2 'geotherm':4 'grout':10 'handl':19,24 'instal':14 'materi':18,23 'oil':1 'pneumat':16 'pressur':9 'servic':11 'system':20 'well':5

oil, gas and geothermal well treatment, perforating fracturing, stimulating and plugging

'fractur':8 'gas':2 'geotherm':4 'oil':1 'perfor':7 'plug':11 'stimul':9 'treatment':6 'well':5

H HALLIBURTON

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