ELECTRICAL SIGNALLING, MEASURING, COUNTING, RECORDING, MONITORING, TESTING, OPEN AND CLOSED-LOOP CONTROL AND SWITCHING DEVICES, NAMELY, LOW-VOLTAGE ELECTRIC SWITCHES, CONTRACTORS, OVERLOADED SWITCHES, RELAYS, ELECTRIC SWITCHES WITH ACTUATOR-SENSOR INTERFACES TO CENTRAL CONTROL UNITS; SAFETY SWITCHES, NAMELY, MECHANICAL POSITION INDICATING SWITCHES; DATA PROCESSING COMPUTER SOFTWARE FOR OPERATING ELECTRIC SWITCHES

'actuat':31 'actuator-sensor':30 'central':35 'close':11 'closed-loop':10 'comput':47 'contractor':23 'control':13,36 'count':4 'data':45 'devic':16 'electr':1,21,27,51 'indic':43 'interfac':33 'loop':12 'low':19 'low-voltag':18 'measur':3 'mechan':41 'monitor':6 'name':17,40 'open':8 'oper':50 'overload':24 'posit':42 'process':46 'record':5 'relay':26 'safeti':38 'sensor':32 'signal':2 'softwar':48 'switch':15,22,25,28,39,44,52 'test':7 'unit':37 'voltag':20

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