ARTEK LTD.STİ
Mühendislik, Insaat, Taahhüt, Sanayi ve Ticaret Ltd. Sti.
Engineering, Construction & Industry Ltd.
environmental engineering, civil engineering, water supply, sewerage, water, waste-water and industrial waste-water treatment plants, solid waste management, mechanical engineering, electrical engineering, structural engineering, geotechnics and environmental services
