waste water and sewage treatment plants; solid waste treatment and disposal units; clarifiers, scrubbers, filters, and filtration and heat exchange media for use in municipal and industrial waste water treatment units and air pollution control units, incinerators for municipal and industrial waste; atmospheric oxygen separation units; water purification units; water purifying untis for potable water for domestic and commercial use; water distillation units; steam electric radiators for heating buildings; furnace boilers, gas boilers; air conditioners, air purifiers and filters for commercial and industrial use, air ventilators, refrigerators, steam generators for commercial use
Environmental Control Apparatusconstruction, repair, maintenance, and installation of waste water and sewage treatment plants; solid waste treatment and disposal units and air pollution control units; water purification units, water purifying units for potable water for domestic and commercial use; water distillation units; steam/electric radiators for heating buildings; furnace boilers, gas boilers; air conditioners, air purifiers for commercial and industrial use, air ventilators, refrigerators, steam generators for commercial use; waste disposal services for others; collection and disposal of domestic and industrial refuse, residues and sludge
Building Construction and Repairtreatment of waste; water treatment; sewage treatment plants; anti-pollution plants for the treatment of domestic and industrial refuse, residues and sludge
Treatment of Materialsdestruction of waste; sanitation consulting and engineering; design, engineering and consulting services in the field of waste water and sewage treatment and disposal units and air pollution control units
Computer and Scientific