000  $anz n  2
000  $a주제어
001  $aKSH2004036155
005  $a20040829223952
008  $a040829 n azknnaabn          |a a|a    | 
150  $a전기 주파수계[電氣周波數計]
450  $wr$i영어$aelectrical frequency meter
550  $wg$a주파수계[周波數計]