00000nz  a2200000n  4500
001  KSH1998000409
005  19980429124741
008  980429 n azknn|abn          |a a|a    | 
150  ▼aCDDI▲
450  ▼wr▼i영어▼acopper distributed data interface▲
550  ▼aFDDI▲
550  ▼aPHY▲
550  ▼aPMD▲