정일남 이정석 황상요 2024-01-12T10:36:37Z 2024-01-12T10:36:37Z 1989-10-10 https://pubs.kist.re.kr/handle/201004/84733 자동차　방열기용　부동액　조성물 Patent 1989-10-10 1988-07-01 4,873,011 214,680 US 특허 한국과학기술연구원