Year The company was officially established with the name: DIAMOND CONSTRUCTION AND TRADING SERVICE JOINT STOCK COMPANY Headquartered at Kim Lien Street - Hung Chinh - Vinh City - Nghe An With the AVDOOR door brand, which has been granted a license by the National Office of Intellectual Property. trademark protection and being used by customers with great trust and satisfaction about product quality. With the goal of bringing to customers the architectural aluminum and glass product lines and smart rolling doors that are durable, economic, aesthetic, effective and of high value.