00000nz  a2200000n  4500
001  KSH1998021814
005  20031030224703
008  980429 n azknn|abn          |a a|a    | 
150  ▼a그릿 제거[--除去]▲
450  ▼wr▼i영어▼agrit removal▲
550  ▼a그릿 챔버[grit chamber]▲
550  ▼a그릿[grit]▲
550  ▼a정화(깨끗한)[淨化]▲
550  ▼a침강[沈降]▲
550  ▼a퇴적 작용[堆積作用]▲
550  ▼a하수 처리[下水處理]▲