belt filter presses, [mechanical surface aerators for use in aeration tanks], sludge thickening machines; fluid control equipment in the nature of fluid passageway closures for use in water and waste water treatment facilities, namely sluice gates, stop gates, and logs

'aerat':6,10 'belt':1 'closur':24 'control':16 'equip':17 'facil':33 'filter':2 'fluid':15,22 'gate':36,38 'log':40 'machin':14 'mechan':4 'name':34 'natur':20 'passageway':23 'press':3 'sludg':12 'sluic':35 'stop':37 'surfac':5 'tank':11 'thicken':13 'treatment':32 'use':8,26 'wast':30 'water':28,31

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