00000nz  a2200000n  4500
001  KSH1998042498
005  19990530175038
008  980619 n azknn|abn          |a a|a    | 
150  ▼a광검파용 진행파관▲
450  ▼wr▼i영어▼aoptical detection travelling wave tube▲
550  ▼a레이저 통신[--通信]▲