measuring apparatus for measuring the quality and quantity of electricity and its properties; measuring devices, electric, namely, electric sensors; electric measuring devices, namely, sensors for measuring alternating current (AC), direct current (DC), direct current (DC) leakage, alternating current (AC) and direct current (DC) Hall effect, voltage, and energy; surveying apparatus and instruments; electrical inductors; coils, electric; electromagnetic coils; variometers; electrical transducer; electrical mutual inductor; electric installations for the remote control of industrial operations

'ac':29,39 'altern':27,37 'apparatus':2,50 'coil':55,58 'control':70 'current':28,31,34,38,42 'dc':32,35,43 'devic':15,22 'direct':30,33,41 'effect':45 'electr':10,16,18,20,53,56,60,62,65 'electromagnet':57 'energi':48 'hall':44 'inductor':54,64 'industri':72 'instal':66 'instrument':52 'leakag':36 'measur':1,4,14,21,26 'mutual':63 'name':17,23 'oper':73 'properti':13 'qualiti':6 'quantiti':8 'remot':69 'sensor':19,24 'survey':49 'transduc':61 'variomet':59 'voltag':46

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