Acoustic sound alarms; Burglar alarms; Electric door bells; Fire alarms; Light emitting diodes (LEDs); Lightning rods; Parking meters; Scales; Smoke detectors; Time clocks; Time switches, automatic; Traffic-light apparatus; Triodes; Vehicle breakdown warning triangles; Electronic regulating and control devices for the operation of light emitting diodes

'acoust':1 'alarm':3,5,10 'apparatus':30 'automat':26 'bell':8 'breakdown':33 'burglar':4 'clock':23 'control':39 'detector':21 'devic':40 'diod':13,47 'door':7 'electr':6 'electron':36 'emit':12,46 'fire':9 'led':14 'light':11,29,45 'lightn':15 'meter':18 'oper':43 'park':17 'regul':37 'rod':16 'scale':19 'smoke':20 'sound':2 'switch':25 'time':22,24 'traffic':28 'traffic-light':27 'triangl':35 'triod':31 'vehicl':32 'warn':34

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