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发明名称
INNRETNING FOR AA DRIVE ROERFORMEDE ELEMENTER NED I OG OPP AV ET BOREHULL
摘要
申请公布号
NO820521(A)
申请公布日期
1982.08.24
申请号
NO19820000521
申请日期
1982.02.19
申请人
VANN, ROY R.,
发明人
VANN, ROY R.,
分类号
E21B19/22;E21B33/068;(IPC1-7):E21B/
主分类号
E21B19/22
代理机构
代理人
主权项
地址
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