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公开(公告)号:KR100731657B1
公开(公告)日:2007-06-22
申请号:KR1020060001830
申请日:2006-01-06
Applicant: (주)서돌전자통신
Inventor: 김문국
IPC: G08B25/10 , G08G1/095 , G08G1/07