TY - GEN AU - 이정환 PY - 1982/12 UR - http://repository.krei.re.kr/handle/2018.oak/13006 TI - 휴대용 동력예취기 NB30K NB40 (북성기계) TT - Portal motor-powered weeder NB30K NB40 (Bukseong Machinery) TA - Lee, Junghwan TA - Cho, Duckrae ER -