Electronic controllers for waste water purification units; electronic solenoids in the nature of coils, valves, pump contactors for controlling waste water purification units; and float electrical switches for use with waste water purification units

'coil':14 'contactor':17 'control':2,19 'electr':26 'electron':1,8 'float':25 'natur':12 'pump':16 'purif':6,22,33 'solenoid':9 'switch':27 'unit':7,23,34 'use':29 'valv':15 'wast':4,20,31 'water':5,21,32

Purification installations for sewage; Sewage purification apparatus; Sewage purification installations; Waste water purification apparatus, installations and tanks; Waste water purification units

'apparatus':7,14 'instal':2,10,15 'purif':1,6,9,13,20 'sewag':4,5,8 'tank':17 'unit':21 'wast':11,18 'water':12,19

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