Lightning conductors; electric field balancers in the nature of electronic devices for monitoring electric fields; electromagnetic field protectors being electromagnetic measuring detectors; electrodes; earthing rods being electrodes for lightning conductors; earthing rods being electrodes for multiple electric field balancers; earthing rods being electrodes for electromagnetic field protectors; electric conductors

'balanc':5,39 'conductor':2,30,49 'detector':22 'devic':11 'earth':24,31,40 'electr':3,14,37,48 'electrod':23,27,34,43 'electromagnet':16,20,45 'electron':10 'field':4,15,17,38,46 'lightn':1,29 'measur':21 'monitor':13 'multipl':36 'natur':8 'protector':18,47 'rod':25,32,41

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