Electric frequency converter for controlling the speed of an electric motor; Electronic variable speed controller for oilfield surface and downhole wellbore equipment; Electronic controller for use in the oil and gas industry for monitoring wellbore data, data from surface equipment and data from the wellbore equipment

'control':5,15,24 'convert':3 'data':36,37,42 'downhol':20 'electr':1,10 'electron':12,23 'equip':22,40,46 'frequenc':2 'gas':31 'industri':32 'monitor':34 'motor':11 'oil':29 'oilfield':17 'speed':7,14 'surfac':18,39 'use':26 'variabl':13 'wellbor':21,35,45

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