[ Circuit breakers; ] Electrical plugs and sockets; [ Geiger counters; Graduated glassware; ] Horns for loudspeakers; Photographic cameras; [ Pressure measuring apparatus; ] Surveying machines and instruments [ ; Switches, electric; Voltage regulators for electric power ]

'apparatus':18 'breaker':2 'camera':15 'circuit':1 'counter':8 'electr':3,24,28 'geiger':7 'glasswar':10 'graduat':9 'horn':11 'instrument':22 'loudspeak':13 'machin':20 'measur':17 'photograph':14 'plug':4 'power':29 'pressur':16 'regul':26 'socket':6 'survey':19 'switch':23 'voltag':25

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