9
Electrical apparatus and instruments for control of automatic operation of sewage clarification plants and wastewater treatment plants; electrical apparatus and instruments for controlling the automatic operation of facilities for mixing and aeration of sewage, floating sludge and return sludge for working of a biological sewage purification process
11
Apparatus, instruments and mechanical equipment for clarification plants and wastewater treatment plants, namely-- apparatus and instruments for aeration and circulation; stirrers; hyperboloid stirrers; drawing devices for stirrers; submersed motors for stirrers; water distribution devices, fillings for trickling filters comprising pieces of rock and/or synthetic material and/or filling elements fabricated of porous materials; pumps for sewage and sludge; devices for lifting; cranes; clarification plants and wastewater treatment plants comprising the above- mentioned components; facilities for mixing and aeration of sewage, floating, sludge and return sludge for working of a biological sewage purification process
42
Engineering, architectural consultation and construction drafting, technical consultation, all of them in the fields of aeration, drainage, treatment of sewage and sludge; computer programming
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