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