차영수 송가혜 박통일 2024-01-12T17:00:10Z 2024-01-12T17:00:10Z 2020-08-28 https://pubs.kist.re.kr/handle/201004/91830 유압그리퍼 Patent 2020-08-28 2018-11-05 10-2151653 10-2018-0134260 KO 특허 한국과학기술연구원