이명현 김대준 2024-01-12T08:35:26Z 2024-01-12T08:35:26Z 2003-07-02 https://pubs.kist.re.kr/handle/201004/82200 도재내관의　제조방법 Patent 2003-07-02 1997-04-24 0826642 97302814.5 특허 한국과학기술연구원