Doanh Thanh Co., Ltd specializes in manufacturing and supplying industrial gas and gas equipment of all kinds such as: Argon gas, CO2, Nitrogen gas, Oxygen gas, mixing gas, cylinders, valves, pipes, etc.Doanh Thanh Co., Ltd specializes in manufacturing and supplying industrial gas and gas equipment of all kinds such as: Argon gas, CO2, Nitrogen gas, Oxygen gas, mixing gas, cylinders, valves, pipes, etc.