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公开(公告)号：HK1043821B
公开(公告)日：2005-06-24
申请号：HK02105235
申请日：2002-07-16
Applicant: KOREA TELECOMMUNICATION
Inventor： MYUNG WOO SEO , JEONG KWEN PARK , WANG KYU KANG
IPC: E21D9/06 , F16L20060101 , E01F5/00 , E02D29/045 , E21B7/04 , E21B7/20 , F16L1/024
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