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发明名称
TUBULAR ELEMENT
摘要
申请公布号
GB8709229(D0)
申请公布日期
1987.05.20
申请号
GB19870009229
申请日期
1987.04.16
申请人
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ BV
发明人
分类号
E21B7/06;E21B17/10
主分类号
E21B7/06
代理机构
代理人
主权项
地址
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