Explosive charges for use in setting tools in oil wells

'charg':2 'explos':1 'oil':9 'set':6 'tool':7 'use':4 'well':10

System for firing perforating guns comprised of a downhole electronic circuit, electronic circuit board, electric circuit and electronic surface unit and interface box for selecting, arming and triggering perforating guns, for use in the oil and gas industry

'arm':26 'board':14 'box':23 'circuit':11,13,16 'compris':6 'downhol':9 'electr':15 'electron':10,12,18 'fire':3 'gas':37 'gun':5,30 'industri':38 'interfac':22 'oil':35 'perfor':4,29 'select':25 'surfac':19 'system':1 'trigger':28 'unit':20 'use':32

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