Electric switches; lightning conductors; lightning rods; switches, electric; electric door bells; connections, electric; voltage surge protectors; couplings, electric; circuit breakers; anti-theft warning apparatus for personal safety; fire alarms; traffic-light apparatus being signalling devices; smoke detectors; signal bells

'alarm':30 'anti':22 'anti-theft':21 'apparatus':25,34 'bell':11,41 'breaker':20 'circuit':19 'conductor':4 'connect':12 'coupl':17 'detector':39 'devic':37 'door':10 'electr':1,8,9,13,18 'fire':29 'light':33 'lightn':3,5 'person':27 'protector':16 'rod':6 'safeti':28 'signal':36,40 'smoke':38 'surg':15 'switch':2,7 'theft':23 'traffic':32 'traffic-light':31 'voltag':14 'warn':24

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