Gas meters for use in the oil and gas industry; Petroleum gas flow meters; Petroleum gas flow monitors; Oil and gas line pressure indicators; Computer-controlled apparatus for testing and measuring the presence and/or flow rate of oil and gas in a pipeline or conduit; Electric or electronic sensors for detecting the presense and flow rate of oil and gas in a transmission line; Gas sensors for measuring petroleum gas concentration; Photoionization detectors (PIDs); Pressure sensors

'and/or':35 'apparatus':28 'comput':26 'computer-control':25 'concentr':72 'conduit':46 'control':27 'detect':52 'detector':74 'electr':47 'electron':49 'flow':13,17,36,56 'gas':1,9,12,16,21,41,61,66,71 'indic':24 'industri':10 'line':22,65 'measur':32,69 'meter':2,14 'monitor':18 'oil':7,19,39,59 'petroleum':11,15,70 'photoion':73 'pid':75 'pipelin':44 'presenc':34 'presens':54 'pressur':23,76 'rate':37,57 'sensor':50,67,77 'test':30 'transmiss':64 'use':4

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