Shandong catalpa east international trade co., LTD., which owns many kinds of doors and Windows manufacturing companies and the processors, mainly engaged in processing all kinds of industrial special doors and Windows and doors and Windows broken bridge aluminum high-end system, its DE He Windows and doors co., LTD in China to participate in national multiple engineering project construction, benchmarking project have jinan north of cogeneration project, brocade based medical square cabinet door supplier, Shandong CRRC Wind power Co., LTD.