Personal protection devices, namely, portable analyzing units which detect the presence and concentration of gases, in particular of combustible gases, flammable gases, volatile organic compounds, toxic gases, oxygen, hydrogen sulfide, carbon monoxide and/or other hazardous gases in air, and provide audible and visual warning

'air':38 'analyz':6 'and/or':33 'audibl':41 'carbon':31 'combust':19 'compound':25 'concentr':13 'detect':9 'devic':3 'flammabl':21 'gase':15,20,22,27,36 'hazard':35 'hydrogen':29 'monoxid':32 'name':4 'organ':24 'oxygen':28 'particular':17 'person':1 'portabl':5 'presenc':11 'protect':2 'provid':40 'sulfid':30 'toxic':26 'unit':7 'visual':43 'volatil':23 'warn':44

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