removable steam valves used in and as part of plates for use in apparatus, called columns or towers, which affords contact between gas, or vapor, and liquid, for the purpose of effecting fractionation, otherwise called distillation, absorption, or stripping

'absorpt':37 'afford':20 'apparatus':14 'call':15,35 'column':16 'contact':21 'distil':36 'effect':32 'fraction':33 'gas':23 'liquid':27 'otherwis':34 'part':8 'plate':10 'purpos':30 'remov':1 'steam':2 'strip':39 'tower':18 'use':4,12 'valv':3 'vapor':25

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