electric-field sensors; magnetic-field sensors; electromagnetic sensors; capacitive sensors; transmitters of electric current; magnetic-field transmitters; electronic data recorders; surveying instruments; electric-field sensing systems comprising electric- field sensors or electric potential sensors and computer hardware and software for transmitting or interpreting data sensed; magnetic-field sensing systems comprising magnetic-field sensors and computer hardware and software for transmitting or interpreting data sensed

'capacit':11 'compris':31,55 'comput':40,61 'current':16 'data':22,48,69 'electr':2,15,27,32,36 'electric-field':1,26 'electromagnet':9 'electron':21 'field':3,7,19,28,33,52,58 'hardwar':41,62 'instrument':25 'interpret':47,68 'magnet':6,18,51,57 'magnetic-field':5,17,50,56 'potenti':37 'record':23 'sens':29,49,53,70 'sensor':4,8,10,12,34,38,59 'softwar':43,64 'survey':24 'system':30,54 'transmit':45,66 'transmitt':13,20

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