박종구 조소혜 김소나 2024-01-12T11:02:17Z 2024-01-12T11:02:17Z 1997-04-18 https://pubs.kist.re.kr/handle/201004/85111 초경합금　분말의　산화방지법 Patent 1997-04-18 1995-10-17 2628852 7-268388 JA 특허 한국과학기술연구원