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':31,56 'comput':41,62 'current':16 'data':22,49,70 'electr':2,15,27,33,37 'electric-field':1,26,32 'electromagnet':9 'electron':21 'field':3,7,19,28,34,53,59 'hardwar':42,63 'instrument':25 'interpret':48,69 'magnet':6,18,52,58 'magnetic-field':5,17,51,57 'potenti':38 'record':23 'sens':29,50,54,71 'sensor':4,8,10,12,35,39,60 'softwar':44,65 'survey':24 'system':30,55 'transmit':46,67 'transmitt':13,20

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