fire detectors; intelligent fire detectors for detecting heat, smoke, flame, gas; fire detectors using sound fields and sound waves sensing; alarm monitoring systems for detecting fire, gas or water leaks, security threats using sound fields and sound waves sensing; sensors for detecting fire, gas or water leaks, security threats using sound fields and sound waves

'alarm':21 'detect':7,25,42 'detector':2,5,13 'field':16,35,52 'fire':1,4,12,26,43 'flame':10 'gas':11,27,44 'heat':8 'intellig':3 'leak':30,47 'monitor':22 'secur':31,48 'sens':20,39 'sensor':40 'smoke':9 'sound':15,18,34,37,51,54 'system':23 'threat':32,49 'use':14,33,50 'water':29,46 'wave':19,38,55

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