[Sludge treatment equipment and installations for urban and industrial wastewater plants, namely, sludge dehydration equipment in the nature of vacuum filters, belt pressure filters, filter presses, sand filters and dewatering machines, all of the foregoing for wastewater treatment]

Equipment and installations for treating sludge from sewage stations for urban and industrial wastewater, namely, sludge dehydration equipment in the nature of vacuum filters, belt pressure filters, filter presses, sand filters and dewatering machines, all of the foregoing for wastewater