SYM Tower Crane Contruction Co., Ltd, is located in Shenyang, the Chinese machinery industry manufacture and production base, and is large enterprise of national construction machinery manufacturing. It owns Shenyang Yiding Technology Co., Ltd (for design), SYM Tower Crane Spare Parts Co., Ltd (for spare parts supply and sale), Shenyang Runpeng Construction Machinery Co., Ltd (for lease), and based on original Shenyang Construction Machinery Factory (has 60 years of tower crane manufacture history), forms a tower crane industrial complex of research and design, manufacture, lease, installation and service. The enterprise has been rapid developed in recent years, with an area of 1,080,000 square meters, and has become a super large manufacturing base of tower crane in domestic and overseas. The main products are ZCJJ brand series of tower crane, and it has 2300 sets of various big, heavy and top facilities, equipped with specializing production center such as metal structure, mechanical processing, heat treatment, production package, and matched with comprehensive economic entity of steel pretreatment, assembly production lines. ZCJJ brand series of tower crane take advantage of technology from France, Germany, Spain, Italy and other foreign advanced countries, combined with the national standard of tower crane, design and produce various types of tower crane all meet GB/T13752 Design Criteria of Tower Crane, GB9462 Tower Crane Technical Configuration, ISO9001, CE Certificate. Now forms 25 specifications and 58 models of ZCJJ series tower crane.