00000nz  a2200000n  4500
001  KSH1999019281
005  19990622204826
008  990622 n azknn|abn          |a a|a    | 
150  ▼a열음극 방전관[熱陰極放電管]▲
550  ▼wg▼a방전관[放電管]▲
550  ▼wh▼a사이러트론[thyratron]▲
550  ▼a냉음극 방전관[冷陰極放電管]▲