... the wind opening-180. Introduction companyQingdao Yongjian Marine Machinery Manufacture Co., Ltd. Is a company specializing in ship ventilators, ... certification of the factory,and to produce,manufacture.Consistent with the Nippon Kaiji Kyokai(NK), ... use of shipbuiding,petrochemical industry,machinery and construction.Qingdao Yongjian Marine Machinery Manufacture Co., Ltd.Will be “good market reputation ...