• TURKISH MINISTRY OF ENVIRONMENT

• TURKISH GENERAL DIRECTORATE OF STATE HYDRAULIC WORKS

• TURKISH GENERAL DIRECTORATE OF MINERAL RESEARCH AND EXPLORATION

• ANKARA METROPOLITAN MUNICIPALITY

• ETİ MİNE WORKS GENERAL DIRECTORATE

• CANKAYA MUNICIPALITY

• AKFEN ENERGY AND CONSTRUCTION

• HEZEN CONSTRUCTION LIMITED COMPANY

• PAR-SU CONSTRUCTION LIMITED COMPANY

• CAN-KA CONSTRUCTION LIMITED COMPANY

• YUMA CONSTRUCTION LIMITED COMPANY

• HASFIRAT CONSTRUCTION LIMITED COMPANY

• ABDULKADIR BEGEN ENGINEERING CONSULTING LIMITED COMPANY

• YEN CONSTRUCTION LIMITED COMPANY

• YILDIZAK CONSTRUCTION LIMITED COMPANY

• DOGULU CONSTRUCTION LIMITED COMPANY

• ASEL YAPI CONSTRUCTION LIMITED COMPANY

• PARSAN YAPI CONSTRUCTION LIMITED COMPANY

• YAGMURCAN CONSTRUCTION LIMITED COMPANY

• PARK ENERGY GROUP

• GM ENGINEERING CONCULTANCY LIMITED COMPANY

• ATAK CONSTRUCTION LIMITED COMPANY

• OZINA MINING CONSULTING LIMITED COMPANY

• ECE MARBLE AND TOURISM LIMITED COMPANY

• JURA MADENCİLİK CONSULTING LIMITED COMPANY

• FEKA CONSTRUCTION LIMITED COMPANY

• BEGEN CONSTRUCTION LIMITED COMPANY

• PROBAY CONSTRUCTION LIMITED COMPANY

• GHIZA CONSTRUCTION LIMITED COMPANY

• KC CONSTRUCTION ENGINEERING LIMITED COMPANY

• EAG CONSTRUCTION AND EXPORT LIMITED COMPANY

• ONAY CONSTRUCTION AND ARCHITECTURE LIMITED COMPANY