7
machine devices and apparatuses for cleaning of waste water construction and sewage plants, namely, electrical sewage and wastewater treatment apparatus and instruments, namely, stirrers, hyperboloid stirrers, mixers and propellers, drawing devices for stirrers, submersible motors for mixing tools, fillings for trickling filters, machine waste water pumps, mud pumps, machine fluid circulating pumps, sewage and sludge pumps, agitators, all for the use in the automatic operation of sewage clarification plants and wastewater treatment plants; electrical sewage and wastewater treatment apparatus and instruments, namely, stirrers, hyperboloid stirrers, mixers and propellers, drawing devices for stirrers, submersible motors for mixing tools, fillings for trickling filters, machine waste water pumps, mud pumps, machine fluid circulating pumps, sewage and sludge pumps, agitators, all for the use in the automatic operation of facilities for mixing and aeration of sewage, floating sludge, and return sludge as part of a biological sewage purification process
11
aeration devices, namely, aerators for waste water and waste water purification units; devices for water treatment, namely, thickening and dewatering machines for use in the treatment of waste water; devices for mixing and aerating of waste water and return mud for effecting biological waste water treatment processes, namely, mixers and stirrers
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