... canton fair every year.Germany Dusseldorf fair in 2008.IranTehran oil show in 2010.Quality Control:Good quality control system ... , 000, 000. Our factory which is invested by Korea Kum Kang Corporation locates in Qingdao, China, 20KM far from Qingdao International ... ISO9001, KS, API certified. Our products are sold well in Korea, Japan, Singapore, Malaysia, Vietnam, South America, Middle East countries ...