000  $anz n  2
000  $a주제어
001  $aKSH1998001918
005  $a19980429124737
008  $a980429 n azknnaabn          |a a|a    | 
150  $aCBX
450  $a시비엑스[CBX]
450  $wr$i영어$acomputer-controlled private automatic branch exchange
550  $wg$a교환 시스템[交換--]