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发明名称
FREMGANGSMAATE FOR OPPRETTELSE AV EN BROENN I EN MAALSONE I EN FORMASJON.
摘要
申请公布号
NO166969(B)
申请公布日期
1991.06.10
申请号
NO19850003033
申请日期
1985.07.31
申请人
HYDRIL COMPANY
发明人
GOODHART, MILTON E.
分类号
E21B4/02;E21B7/06;E21B7/08;E21B43/30;(IPC1-7):E21B7/04
主分类号
E21B4/02
代理机构
代理人
主权项
地址
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