Đồng hồ chất liệu: Th%EF%BF%BD%EF%BF%BDp%20Kh%EF%BF%BD%EF%BF%BDng%20G%EF%BF%BD%EF%BF%BD%EF%BF%BD%20,%20M%EF%BF%BD%EF%BF%BD%EF%BF%BD%20V%EF%BF%BD%EF%BF%BDng%20H%EF%BF%BD%EF%BF%BD%EF%BF%BDng%20C%EF%BF%BD%EF%BF%BDng%20Ngh%EF%BF%BD%EF%BF%BD%EF%BF%BD%20PVD