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¿µ¹® °úÁ¦¸í Original call control system for long distance direct dialing
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°úÁ¦½ÃÀÛ 1989-10-05
ÃʾÈÀÛ¼ºÁß 1989-10-05
´ÜüǥÁؾȽÉÀÇ 1990-06-08
Ç¥ÁØ°ø°í 1990-06-08