Qingdao Tanzon Heavy Industrial Machinery Co.,Ltd (TZHI) established on 2002. We focus on tower crane R&D more than 10 years. We are professional manufacturer of tower crane and crane mast section. Our factory area is 70,000m2 , industrial plants area 25,000m2 .Have more than 300 sets heavy equipment. Employees more than 200 peoples, including 20 technician.