박영우 2024-01-12T08:09:26Z 2024-01-12T08:09:26Z 1993-02-15 https://pubs.kist.re.kr/handle/201004/81824 제강용　전기로　분진으로부터　염화아연의　제조방법 Patent 1993-02-15 1989-12-29 59378 89-20254 KO 특허 한국과학기술연구원