Scientific, optical, measuring, signaling, checking, and supervision apparatus and instruments, namely, video cameras for visualizing gas clouds; sound and visual alarms to detect gas; gas alarms; gas imaging systems, namely, gas detectors for visually detecting the presence of gas; gas detectors; infrared cameras to detect gas; apparatus in the nature of sensors to measure gas concentrations; cameras for monitoring gas in space and time; gas analyzers

'alarm':21,26 'analyz':66 'apparatus':8,47 'camera':13,43,57 'check':5 'cloud':17 'concentr':56 'detect':23,35,45 'detector':32,41 'gas':16,24,25,27,31,39,40,46,55,60,65 'imag':28 'infrar':42 'instrument':10 'measur':3,54 'monitor':59 'name':11,30 'natur':50 'optic':2 'presenc':37 'scientif':1 'sensor':52 'signal':4 'sound':18 'space':62 'supervis':7 'system':29 'time':64 'video':12 'visual':15,20,34

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