portable calibration gases for air monitoring instrumentation, namely, hydrogen sulfide, sulfur dioxide, carbon dioxide, methane, oxygen, nitrogen, [ nitric oxide, ] propane and mixtures thereof

'air':5 'calibr':2 'carbon':13 'dioxid':12,14 'gase':3 'hydrogen':9 'instrument':7 'methan':15 'mixtur':22 'monitor':6 'name':8 'nitric':18 'nitrogen':17 'oxid':19 'oxygen':16 'portabl':1 'propan':20 'sulfid':10 'sulfur':11 'thereof':23

equipment for dispensing portable calibration gases for air monitoring instrumentation and continuous emissions monitoring systems, namely, confined space entry instrumentation and explosimeters

'air':8 'calibr':5 'confin':17 'continu':12 'dispens':3 'emiss':13 'entri':19 'equip':1 'explosimet':22 'gase':6 'instrument':10,20 'monitor':9,14 'name':16 'portabl':4 'space':18 'system':15

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