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发明名称
PROTECTIVE STRUCTURE
摘要
申请公布号
GB8913886(D0)
申请公布日期
1989.08.02
申请号
GB19890013886
申请日期
1989.06.16
申请人
NORTHERN OCEAN SERVICES LIMITED
发明人
分类号
E21B33/037
主分类号
E21B33/037
代理机构
代理人
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