00000nz  a2200000n  4500
001  KSH1998041929
005  20030530223627
008  980429 n azknn|abn          |a a|a    | 
150  ▼a초퍼 안정화 증폭기[--安定化增幅器]▲
450  ▼wr▼i영어▼achopper stabilized amplifier▲
550  ▼wg▼a증폭기[增幅器]▲
550  ▼a초퍼[chopper]▲