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发明名称
Bop with partially equalized ram shafts
摘要
申请公布号
GB9726681(D0)
申请公布日期
1998.02.18
申请号
GB19970026681
申请日期
1997.12.17
申请人
VARCO SHAFFER INC
发明人
分类号
E21B33/06
主分类号
E21B33/06
代理机构
代理人
主权项
地址
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