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发明名称
SHEAR/WIPER DARTS FOR DRILLPIPES
摘要
申请公布号
GB9312930(D0)
申请公布日期
1993.08.04
申请号
GB19930012930
申请日期
1993.06.23
申请人
ODFELL DRILLING AND CONSULTING COMPANY (UK) LIMITED
发明人
分类号
主分类号
代理机构
代理人
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