Oil and gas equipment in the nature of machines, namely, well perforating guns; machines and machine tools used in commercial oil and gas drilling, namely, corrosion resistant perforating guns for perforating oil and gas wells

'commerci':20 'corros':26 'drill':24 'equip':4 'gas':3,23,34 'gun':13,29 'machin':9,14,16 'name':10,25 'natur':7 'oil':1,21,32 'perfor':12,28,31 'resist':27 'tool':17 'use':18 'well':11,35

Well perforating guns; firing systems used in commercial oil and gas drilling, comprised of explosives for oil and gas drilling; shaped explosive charges used in the perforation of well casings

'case':30 'charg':23 'commerci':8 'compris':13 'drill':12,20 'explos':15,22 'fire':4 'gas':11,19 'gun':3 'oil':9,17 'perfor':2,27 'shape':21 'system':5 'use':6,24 'well':1,29

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