이정환 현공남 조덕래 2018-11-15T07:39:56Z 2018-11-15T07:39:56Z 1982-12 C1982-17 http://repository.krei.re.kr/handle/2018.oak/13006 휴대용 동력예취기 NB30K NB40 (북성기계) Portal motor-powered weeder NB30K NB40 (Bukseong Machinery) KREI 보고서 Lee, Junghwan Cho, Duckrae 9999-12-31 9999-12-31